README: Add the settings for server owners, minor edits.

Drop 0.4.12 compatibility

README.txt

@@ -1,8 +1,8 @@
  Minetest mod: boost_cart
 ==========================
 Based on (and fully compatible with) the mod "carts" by PilzAdam
-Also compatible with the carts mod in the subgame "minetest_game".
-Target: Run smoothly as possible even on laggy server
+and the one contained in the subgame "minetest_game".
+Target: Run smoothly as possible, even on laggy servers.
 
 
  Features
@@ -12,8 +12,25 @@ Target: Run smoothly as possible even on laggy server
 - Boost and brake rails
 - By mesecons controlled Start-Stop rails
 - Detector rails that send a mesecons signal when the cart drives over them
-- Rail junction switching with the 'right-left' walking keys
+- Rail junction switching with the 'right/left' walking keys
 - Handbrake with the 'back' key
+- Support for non-minetest_game subgames
+
+
+ Settings
+----------
+This mod can be adjusted to fit the conditions of a player or server.
+Use the Advanced Settings dialog in the main menu or tune your
+minetest.conf file manually:
+
+boost_cart.speed_max = 10
+   ^ Possible values: 1 ... 100
+   ^ Maximal speed of the cart in m/s
+
+boost_cart.punch_speed_max = 7
+   ^ Possible values: -1 ... 100
+   ^ Maximal speed to which the driving player can accelerate the cart
+     by punching from inside the cart. -1 will disable this feature.
 
 
  License for everything

init.lua

@@ -16,13 +16,6 @@ boost_cart.speed_max = tonumber(setting_getter("boost_cart.speed_max")) or 10
 -- Set to -1 to disable punching the cart from inside
 boost_cart.punch_speed_max = tonumber(setting_getter("boost_cart.punch_speed_max")) or 7
 
-
-if not boost_cart.modpath then
-	-- For Minetest 0.4.12 and older that don't look at the "mod.conf" file
-	error("\nWrong mod directory name! Please change it to 'boost_cart'.\n" ..
-			"See also: http://dev.minetest.net/Installing_Mods")
-end
-
 -- Support for non-default games
 if not default.player_attached then
 	default.player_attached = {}