I would like to request two features.
A: I would like Danbooru to notify me when my upload limit has been reached BEFORE I try to submit my post. At that point, I have already put in the effort to tag it, find the source etc. and then I'll have to do it all again when some of my pending submissions have been approved (or disapproved).
B: I suggest notifying the user when some post were omitted, especially when they belong to a series. In particular, I'm thinking of the loli tag. When you don't show the posts, I would like to be at least to be informed that there is something missing in my search results. (It could also mean a higher incentive for users to upgrade? I'm not sure of the psychological dynamics here.) I repeat, this is especially important in a series, whether the post has a banned tag or has been disapproved.