Program MyHugeProgram
   Include "MySpriteClass.kpl"
   Include "MySoundClass.kpl"
   ...

It would be nice to be able to include whole files to facilitate developing libraries of useful routines.  It would also reduce the size of the source code in the editor.  If such an idea were considered, do plan to make the included file 'appear' to be part of the program even while editing so that Intellisense will work for the included files.