if you're looking specifically for "alt-spc n" to minimise I'm sure you can find a way to make that work - but why? to retain muscle memory between windows and gnome?
I'm pretty sure there's an option to emulate the windows key somewhere too
if you're looking specifically for "alt-spc n" to minimise I'm sure you can find a way to make that work - but why? to retain muscle memory between windows and gnome?