Bunny hopping is always suggested but too many people use it as a basic play style for the idea to work. They lose big time if they dont and that makes them unhappy. So there are some sacred cows. Also low gravity would be interesting so long as everyone keeps in mind that it will make it easier to get to higher places that would normally be considered 'glitching'. So this would only work if the options werent all that significant. Just a little variety one day out of the week.
I always keep in mind that over time when I would introduce something fresh that threw a new element into the game people would bitch at me. But those same things now, if they were changed, I would get bitched at again. Sometimes people should try it before deciding whether or not they like it.