Sure.
I can't promise everything, because units are a good deal different than the engines and I haven't found a decent tutorial on the subject, but I've pretty much figured out how it works. The problem again though, is that there are some bugs in the firelance projectile files. Thunderbombs and vanara peaches too. They won't accept sound effects for the impact and kill animations. I don't know how that works and I don't have the software to change the actual CAS files. Unless that gets figured out, I can only add sounds to the firing animation. Plus I tried listening to the old firelances, and strangely they have a group firing sound of bows, plus an individual firing sound of javelins or slings, so I don't really even know how or where the 'flaming_fireworks' description from descr_export_unit and it's animation files are linking to in sounds. Strange.
But, I'll give it a shot, and since that'd be unpacking the SFX file, if anyone has some fun sounds for dragons, shi shi, and the like, I could try putting that in too.
Maybe the mod inquiry board can help...