gmadden- yes, lots of sensors in SpaceBlade.
Option 4 - ‘fat press’ thumb spanning multiple sensors.
Option 5 - sweep thumb across to toggle state. No press needed.
Plenty of options, more driven by what feels best - what’s most natural and mnemonic.
It can emulate past adobe practice, or it can be new in a way that may be much better.
It’s not a keyboard, it’s a computer. Machine intelligence to understand human intent.
Lots of fresh canvas to do what we want here.
Good timing to lobby for your preferences.