Using a levelgen script
From Bitfighter
To include a levelgen script in a level, edit the level file, and insert a line like the following:
Script scriptname.levelgen [arg1] [arg2] [arg3] ...
When the level is loaded, the script scriptname.levelgen will be run. This script can then create level elements, as specified in the Programming levelgens section. The optional arguments arg1, arg2, arg3, etc. will be passed to the script, so the same levelgen script can be used in different ways by different levels.
Currently, Bitfighter assumes that the levelgen script is in the same folder as the level file that calls it.