We don't really have any dedicated developers in that sense either way. If you made a boss or map that you'd like us to add to our servers you can suggest it here.
This is the way all new content goes, there's really no requirements. If your suggestion is good and the community votes for it it usually gets added sooner or later.
Although as Kruphixx already said playing on our server to gain an understanding of what content might fit definitely doesn't hurt.