I sometimes run into the problem of not having enough space for a level title. Now I don't like a lot of overly long level titles, but it'd be nice to have at least a slightly larger field. Also the menu screen might be able to be improved upon to allow for more space but also for better visibility. For example; if the "author","rating" text were a different color or size than the numbers.
In terms of allowing longer names / etc: These are a limitation of the current file format, just like the 16 character limit for music file names. Once new formats are in use, it'll be a thing of the past.
The more visibility, I'll keep that in mind. :)