Better would be rating gain/loss instead of fixed rating, given this is the bughouse forum. Limits games where the average rating differs greatly while the ratings on one board are similar. For example, 2000/2000 vs. 2000/200 has an average rating differential of 900, while the single-board differential is 0 on one board.
Why are rating limits set to +-400? Why not any selected number?
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Could just enter a +- number or slidebar.
Or at least add either a +-600 or 800
Not enough players to use +-400 and infinite is not fun so everyone is constantly dodging.