[plt-scheme] Does anyone have non-standard keybindings for OS X that they would like to share?

Does anyone have non-standard keybindings for OS X that they would
like to share?

Since I am going to have to remap all of the insert matching brackets
commands, I am wondering if anyone has done and made additional
improvements in the process that they could share.

I haven't tried doing so yet, but I wonder if there is an issue with
making alt+shift+bracket a mapping since it is the default on Windows
but not OS X.

I would like to use roughly the same mappings as in Windows; but I am
guessing there is some reason they are different. Is there?