The Engineers Guild is of course an example of where 'significant' mods have been stickied. And I think you'd agree it's a bit out of hand with almost an entire page of stickies.

The idea of two stickies - one for 'completed' mods and one for other 'significant' mods - is a good one I think. When I say 'significant', I mean one that is actually notably under development, as opposed to merely a suggestion or some early musings.