Congrats to both of you!
It's really too bad that the DC coders are having so much trouble with saving files for FRIK_FILE support. They seem like a cool community.
Anyway, a few things I recommend for Conquest support:
checkextension
alpha
glowing
large model/skin support
pow & other math functions
MOVETYPE_BOUNCE and FOLLOW
TE_SPARK and other DP effects
Near the top of 0defs.qc I list all the extensions Conquest checks for, so you can usually know what's being used. However, I'm forgetting to check for .spr32 support and a few other things (as pointed out by Entar), so it looks like I'll have to be more careful to keep compadibility up.
When my computer inevitably explodes and kills me, my cat inherits everything I own. He may be the only one capable of continuing my work.