A couple of TAP key questions

I just got my m6t0 PCBA today and I’m totally loving it. However, I’ve not been able to figure out how to accomplish the following two things:

  1. How can I bind keys to permanently change layers? I’d like to use one layer to swap the alt an gui keys for instance, since I use Linux, Mac, an Windows on a daily basis
  2. How can I set a tap key to output two different keys, rather than simply swapping layers on hold? For instance, I have my anne pro 2 set up so that tapping outputs ESC, but holding outputs “`”