What i would like to see is a Downloads module that can be set up so that users need to rate or review a certain amount of downloads (number decided by admin) before they can submit a download.

lets say you set it to 3 reviews. They would have to review 3 downloads for 1 "File Submit" credit which lets them submit one download. Once they have submitted the download they would have to review another 3 downloads to earn another credit. You could also set this for rating aswell or both. Also credits could also accumilate if the rater/reviewer doesnt submit any downloads.

And if they dont want to rate or review you could also set up a bit in admin where you can say that a user has purchased upload credits. Obviously the user would have to purchase them in some way.

You see these features on some audio upload sites and it helps in getting people to write reviews or rate downloads.