Perhaps there could be separate tags for transcriptions, originals, and arrangements?

There's just way too many reasons this would be great... In my case, one of my bandmates also has an account and a friend system would be great for us to compose songs for the band and organize.

A forum is pretty much essential in any site, it brings together the community to discuss various topics. In the case of a music website like this I imagine people would discuss stuff like theory, their own songs and music in general. It kinda surprises me that Noteflight doesn't have a forum yet.

There's one if you get Crescendo, I think you get both a crash and a splash-y one. Still that doesn't change the fact that a crash is essential to mark accents and the start of phrases. An open hi-hat is the closest you can get right now, but still not the same.

A drum set without a crash isn't a drum set. :P It's essential for accents, especially in rock music. I agree with this. Latin percussion would be great as well, though I've never composed in that style.