Hi madCow,
I'm the author of rhLaunch.
It did not support encrypted amiga-forever roms until today.
Had some time and decided to do a quick fix:
http://www.219.dic.at/data/software/projects/rhLaunch/rhlaunch_fix.lhaMake sure you have the file "rom.key" in the same path where the *.rom-files are.
I'll do a full release later, have fun!
EDIT:
Version 0.7 is now available
HERE. (MorphOS only)