I think it would be easier if instead of forum threads to vote the new function suggestions, you'd make also a Features Wishlist.
Everyone write one single function wish or suggestion, and the others vote.
I saw that often people doesn't write their suggestion on the thread title, making a lot of "personal containers thread"; others write their suggestion inside other threads, it all feel a bit confusing and disorganized.
I don't know how much difficult is to make that, but if you plan to make Roll20 a always evolving project after the official launch, i think that it would greatly simplify the things, considering all the people that would come after the closed beta.
To better undestanding, i'll post an image on what exactly i mean, similar to what you have done but more focused on voting and on the single feature desired, moreover in this way everyone would see immediately if the function is already planned or not, avoiding double threads:
Sorry for my english! I was in a hurry! :P