Down to earth ideas:
1. The ability to report rule-violating songs in the AP. Now, if you leave a review saying it's stolen, then that review gets deleted for being abusive. There's really no way to demonstrate that a submission is stolen.
2. More tools for audio mods, such as edit, delete, ban, un-ban, watch-list, etc.
3. The ability to report advertisements which cause browser-crashes and/or extreme slowdowns.
4. The ability to state WHY you are marking a review/advertisement as abusive, in some sort of text box.
5. Auto AP icon submission, so that all of your tracks automatically have the chosen icon.
6. Removal of complete track capitalization when viewing songs on artists' userpages.
7. Increase in characters viewable when viewing songs on artists' userpages. I've seen track titles get cut off because less characters can be seen than the number that are allowed in the titles.
8. Ability to report abusive review responses.
9. Mouse-over thumbnails for audio submissions, like in the FP.
10. Actual USAGE of the Great/Awesome score system. May require some tweaking of numbers,
11. Improved AP search.
Crazy ideas:
1. Blamming in the AP. I know it sounds elitist, but there IS a LOT of terrible music in the AP...
2. Ability to have a sponsorship/commercial licensing system in the AP, as they do in the FP, allowing tracks to be commercially licensed to be used in flash videos or the like. However, this would require something other than the creative commons license to be probable.
3. Ability to edit songs after 3,000 listens/usage, like with flash videos, but not delete.
4. Ability to create custom userpage themes, with standardized dimensions.
5. Ability to add custom links to "other favorites."