Maybe you need to divide the data by frequency of change; that is, have one forum for current info (this one) and a second one for the stickies and other reference material such as plans and photos of completed and/or underway projects.
There would be no need to limit the number of stickies. Posters could link to items in the reference side in their current posts.
You could even divide the reference forum into several pieces, the common thread being relatively static material, while the General forum would remain the place for asking questions, etc.