To cacarr: Inkscape is not at its best in Mac. It's clunky because you have to use control instead of command, can't zoom with the trackpad, can't go fullscreen.

I use it and love it and it's one of my favourite programs, but really it's better in Linux.

A key mapping function sounds like one of them more easy things to add into a piece of software

I assume you've tried Inkscape?