It's going to break layers in a lot of levels, isn't it? Especially older ones. Personally I could not care less what impact it has on online play, especially if everyone chooses to use the same settings.

A solution, though (I imagine) difficult to implement, would be to have j2l's have hardcoded settings for proper screen resolution size and all other video/sound related options.. just to add fairness as well as a fix for old levels, not to mention another layer of customisation for level makers. I suppose another tool to bypass this would just pop up but whatever. Screen resolution could be visible by a server's host and "cheaters" could be kicked as well.. I could muse all day, but I imagine it won't go anywhere, so file this under 'wouldn't it be neat if...'