So I've recently seen a lot of this sort of behavior in a couple groups I Mod for. Members submit new characters with powers or abilities which are either too powerful, not suited for the setting, or are blatantly breaking a rule. When Admin asks the member to edit the ability, set guidelines for it, or limit in some fashion, the member responds with, "If you don't let me have this ability as-is, I quit."
The most recent "Gimme or I quit!" response I received was after telling a member that we would allow him/her to have the overpowered ability for his/her character, but that it must only be used with permission from those people he/she is RPing with. The other admin and I thought that this was a fair compromise. If the members this character was RPing with were okay with the use of the ability, then we were okay with it too. Easy, right? But this member threw a fit and followed it up with the above-mentioned threat.
We generally tell these members, "It's your choice if you'd rather quit, but (rule) applies to everyone, and we feel this is the best compromise in this situation. Let us know what you decide."
Have any of you noticed this sort of behavior trending with any of your applicants? How do you and your admin handle it? Just wanted a little input! Thanks guys!