Multiple non-conflicting mods

[Marshall]

I believe so. That would be awesome.
What I would like to do is
On launching a mod, audio.bag/idx are extracted and "RA2\modname\sound\*.wav and *.ogg" are inserted into the bag/idx on a file per file basis.
Presumably there would be 2 significant DLL calls:
Insert file (in memory)
Save bag (to disk)

Getting the bag/idx out of langmd.mix in the first place, I would probably use the XCC MIX CLT, unless there's a more efficient way.