For RAD I suggest to use arexx + rxMUI.
Rexx is even easier to use than Basic.
http://de.wikipedia.org/wiki/REXX
That way your Applications should run on all Amiga-like Operating-Systems.

Perhaps it would be possible to create a Rexxgenerator for MUIBuilder.

[ Edited by Wishmaster on 2008/7/15 14:25 ]