Make the maximal speed configurable using minetest.conf

init.lua

@@ -2,10 +2,19 @@
 boost_cart = {}
 boost_cart.modpath = minetest.get_modpath("boost_cart")
 
+
+-- Settings glue for <= 0.4.15
+local setting_getter = minetest.setting_get
+if minetest.settings then
+	setting_getter = function (key)
+		return minetest.settings:get(key)
+	end
+end
+
 -- Maximal speed of the cart in m/s
-boost_cart.speed_max = 10
+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 = 7
+boost_cart.punch_speed_max = tonumber(setting_getter("boost_cart.punch_speed_max")) or 7
 
 
 if not boost_cart.modpath then