diff --git a/maps/chronosphere/main.lua b/maps/chronosphere/main.lua
index 3d13b30d..429cc45a 100644
--- a/maps/chronosphere/main.lua
+++ b/maps/chronosphere/main.lua
@@ -232,7 +232,7 @@ function Public.chronojump(choice)
 	objective.lab_cells = {}
 	objective.active_surface_index = game.create_surface("chronosphere" .. objective.chronojumps, Chrono.get_map_gen_settings()).index
 	local surface = game.surfaces[objective.active_surface_index]
-	log("seed of new surface: " .. surface.map_gen_settings.seed)
+	--log("seed of new surface: " .. surface.map_gen_settings.seed)
 	local planet = objective.planet
 	if choice then
 		Planets.determine_planet(choice)
@@ -247,7 +247,7 @@ function Public.chronojump(choice)
 	game.delete_surface(oldsurface)
 	Chrono.post_jump()
 	Event_functions.flamer_nerfs()
-	surface.pollute(objective.locomotive.position, 150 * (4 / (objective.upgrades[2] / 2 + 1)) * (1 + objective.chronojumps) * global.difficulty_vote_value)
+	surface.pollute(objective.locomotive.position, 150 * (3 / (objective.upgrades[2] / 3 + 1)) * (1 + objective.chronojumps) * global.difficulty_vote_value)
 	::continue::
 end
 
@@ -305,14 +305,14 @@ local function tick()
 			objective.chronotimer = objective.chronotimer + 1
 			objective.passivetimer = objective.passivetimer + 1
 			if objective.chronojumps > 0 then
-				if objective.locomotive ~= nil then 
+				if objective.locomotive ~= nil then
 					local surface = game.surfaces[objective.active_surface_index]
 					local pos = objective.locomotive.position or {x=0,y=0}
 					if surface and surface.valid then
 						game.surfaces[objective.active_surface_index].pollute(
-							pos, 
-							(0.5 * objective.chronojumps) * 
-							(4 / (objective.upgrades[2] / 2 + 1)) * 
+							pos,
+							(0.5 * objective.chronojumps) *
+							(3 / (objective.upgrades[2] / 3 + 1)) *
 							global.difficulty_vote_value)
 					end
 				end
@@ -320,8 +320,8 @@ local function tick()
 			if objective.planet[1].name.id == 19 then
 				Tick_functions.dangertimer()
 			end
-			if Tick_functions.check_chronoprogress() then 
-				Public.chronojump(nil) 
+			if Tick_functions.check_chronoprogress() then
+				Public.chronojump(nil)
 			end
 		end
 		if tick % 120 == 0 then
@@ -595,4 +595,4 @@ end
 --    end
 --})
 
-return Public
\ No newline at end of file
+return Public
diff --git a/maps/chronosphere/tick_functions.lua b/maps/chronosphere/tick_functions.lua
index d3372132..e87499ea 100644
--- a/maps/chronosphere/tick_functions.lua
+++ b/maps/chronosphere/tick_functions.lua
@@ -47,7 +47,7 @@ function Public_tick.charge_chronosphere()
 		if energy > 3010000 and objective.chronotimer < objective.chrononeeds - 182 and objective.chronotimer > 130 then
 			acus[i].energy = acus[i].energy - 3000000
 			objective.chronotimer = objective.chronotimer + 1
-			game.surfaces[objective.active_surface_index].pollute(objective.locomotive.position, (10 + 2 * objective.chronojumps) * (4 / (objective.upgrades[2] / 2 + 1)) * global.difficulty_vote_value)
+			game.surfaces[objective.active_surface_index].pollute(objective.locomotive.position, (10 + 2 * objective.chronojumps) * (3 / (objective.upgrades[2] / 3 + 1)) * global.difficulty_vote_value)
 		end
 	end
 end
diff --git a/maps/mountain_fortress_v2/main.lua b/maps/mountain_fortress_v2/main.lua
index 3851614a..026411a3 100644
--- a/maps/mountain_fortress_v2/main.lua
+++ b/maps/mountain_fortress_v2/main.lua
@@ -466,9 +466,9 @@ local function on_init()
 	T.localised_category = "mountain_fortress"
 	T.main_caption_color = {r = 150, g = 150, b = 0}
 	T.sub_caption_color = {r = 0, g = 150, b = 0}
-	global.rocks_yield_ore_maximum_amount = 999
+	global.rocks_yield_ore_maximum_amount = 500
 	global.rocks_yield_ore_base_amount = 50
-	global.rocks_yield_ore_distance_modifier = 0.025
+	global.rocks_yield_ore_distance_modifier = 0.020
 
 	global.explosion_cells_destructible_tiles = {
 		["out-of-map"] = 1500,
diff --git a/modules/admins_operate_biters.lua b/modules/admins_operate_biters.lua
index 2b992154..27797d29 100644
--- a/modules/admins_operate_biters.lua
+++ b/modules/admins_operate_biters.lua
@@ -7,6 +7,7 @@ global.biter_command.enabled = true
 global.biter_command.whitelist = {}
 global.biter_command.admin_mode = true --if only admins can see and use the panel
 global.biter_command.teleporting = false --if teleporting is allowed for non-admins
+global.biter_command.buildings = true ---if player can trigger building nests and worms
 
 local worm_raffle = {
   "small-worm-turret", "small-worm-turret", "medium-worm-turret", "small-worm-turret",
@@ -45,6 +46,7 @@ local function get_evo(force)
 end
 
 local function place_nest_near_unit_group(group)
+  if not global.biter_command.buildings then return false end
   if not group.members then return false end
 	if #group.members < 5 then return false end
   local units = group.members
@@ -66,6 +68,7 @@ local function place_nest_near_unit_group(group)
 end
 
 local function build_worm(group)
+  if not global.biter_command.buildings then return false end
 	if not group.members then return false end
 	if #group.members < 5 then return false end
   local units = group.members
@@ -227,7 +230,7 @@ local function settle(group, source_player)
     flying_text(nil, 1, group.position, source_player)
   else
     flying_text(nil, 2, group.position, source_player)
-    source_player.print("Settling new nest failed. Check if group has enough members(5+) and there is empty space.")
+    source_player.print("Settling new nest failed. Check if group has enough members(5+) and there is empty space (or nests are disabled).")
   end
 end
 
@@ -237,7 +240,7 @@ local function siege(group, source_player)
     flying_text(nil, 1, group.position, source_player)
   else
     flying_text(nil, 2, group.position, source_player)
-    source_player.print("Making worm failed. Check if group has enough members(5+) and there is empty space.")
+    source_player.print("Making worm failed. Check if group has enough members(5+) and there is empty space (or worms are disabled).")
   end
 end