Good suggestions! I'd love to find ways to get people thinking more about the practicalities of actually having their pieces performed. So many pieces are posted here, seemingly with no expectation of it ever going any further than the sound file spit out by their computer. Even if your pieces aren't perfect, you can learn soooooo much from really getting them out there to other musicians who play them. Instead of just getting a quick listen and a review.
I post on choralwiki as well as here. That's the place choir directors go looking for free, downloadable music. Their site is SLOW. And confusing to navigate and hard to search. We could do much better with a little thought and become a destination for chamber groups, solo performers, etc. looking for new music to perform. I hang out on the choral directors forum as well and there are constant requests for suggestions of good new work by contemporary composers. People do want to perform new stuff. They find it exciting to premiere a piece by an unknown composer. They just need to be able to find what they are looking for. Most of the live music performed around the world is performed by volunteer amateurs, so not everything can be composed for a virtuoso. Directors have to make do with the performers they have available, so they may have 3 violins, a tuba, and an organ. There is often an overall theme to their concert that they need one more piece to fit with. Professional symphony orchestras aren't likely to look here for new repertoire, but smaller groups will. (Yay! Free music!)
So I'd suggest:
Some way to classify compositions, not by form, but by instruments required to play it, would be great: boxes to tick for the postee so that their piece would be searchable by instrument(s). Some way to search for a chamber group looking for a piece for violin, viola, baritone and flute that would let them tick all the boxes for those instruments and get a list of the current pieces on the site that match, or partially match, those instruments. You can do that on choralwiki currently, although it's a bit annoying. So people do. And people search.
Some way to tag and search for music by themes. If I'm already programming "The Planets" I want to be able to be able to find your piece for orchestra called "The Stars" or "Neptune" or "Heavenly Bodies" because you've put a tag on it for "astronomy," "space," etc. Again, you can do that to a certain extent on choralwiki.
Support for as many different sound formats as possible, and the ability to post more than one for the same composition, so that the old fart using dial-up who can only figure out how to download a midi file can get the download that way, and the person who wants an mp3 can get it that way, and the person who wants a wav file can get it that way, all for the same piece. All of the options clearly visible and obvious. Most of the compositions on choralwiki have several different ways to listen to the sound file, several ways to view and download the score, a link or two or three to a video… all for the same piece. We are young composers, but some people who would like to perform our work are older and have older person computer skills. If we kept that in mind and provided multiple avenues to exploring our work more often, it would be performed more often.
A forum section for the users of the site who want to use this site to find new work to perform. Where they can ask questions, state things that annoy them about our scores and make them unplayable, state things that they really like… Maybe a really obvious, easy way to attach a sound file or video to a review, so that it occurs to a director to record their group's performance and post the recording along with their thoughts of what went well and what didn't.
And for Pete's sake, everyone clean up your scores. (Pet peeve.)