Improve cli hotkeys to support OSX better

we're using `alt` as a modifier, and it's not behaving as intended on OSX

### Tasks
- [ ] experiment on OSX and pinpoint what's weird
- [ ] look into how [keypress ](https://github.com/TooTallNate/keypress)works
- [ ] look into patching functionality upstream in either [neat-input ](https://github.com/mafintosh/neat-input) or [keypress](https://github.com/TooTallNate/keypress)
- [ ] use a new modifier if all else fails
- [ ] rethink hotkey usage

Start by reproducing the alt-modifier behavior on OSX, then read how keypress handles modifiers and how neat-input integrates it. Determine whether the fix belongs upstream in neat-input or keypress; done means OSX hotkeys behave reliably, or the hotkey scheme has been intentionally revised if the modifier cannot be fixed.

Written by the indexing model from the issue text.