I'd do it my own way. If I see a good idea from a fan I might incorporate it and credit them but otherwise what I see fit is what goes. Either way your fans should be ones that like the work you're putting out so if a few are easily angered by things you put in then they weren't really a good fan to have. Heck no matter what you write it will always please others or make them unpleased even if what you made was created by a fan.
Your the author. Your opinion matters most.