IIRC, a while ago when people were discussing the issue tracker and how suggestions got closed in it, because the issue tracker isn't for suggestions, a CM did say they might consider a similar system for suggestions.
Personally i wouldn't want a similar system. Would give people the idea that if they can rally the votes then FD must do what they want.
However, i would be cool with a similar system without the votes. Basically people can upload, can suggest merges with existing suggestions (because people will raise the same suggestions over and over without checking) - perhaps the merging could have a vote system. Save FD manually merging and allow without enough people confirming its the same suggestion to merge it.
It means there would be a nicely searchable catalogued index of suggestions for FD and players to look at.
Of course, i see a downside, some people would use it negatively. "Look at how many suggestions people have made and FD haven't done any of them! At this time there are 20,000 suggestions that haven't been done! FD suck!"
You just know it.