• Create actions basing on arrays, not hashes;
• Alt-→ etc;
• Keypad???
• Math alphabets???
• Access via Control-Keys.
• Shortcuts to satellites of companion faces (without Mnu-).
• Good terminators for imported prefixes.
• Conditional doHEX
• action⸣s should be CapsLock-dependent if on alphanum, but contain deadkeys (like 'u'/'U' for HEX-unicode)
• Compose + OR Compose SPACE: enable HEX
• Make the offset 4100 customizable, or auto-calculated.

  http://osxnotes.net/keybindings.html
  http://lolengine.net/raw-attachment/blog/2012/06/17/compose-key-on-os-x/DefaultKeyBinding.dict
  http://lolengine.net/blog/2012/06/17/compose-key-on-os-x
  	KeyRemap4MacBook:
  https://pqrs.org/osx/karabiner/index.html.en

Compose stuff is pre-filtered (output = 1 UTF-16 codepoint) for Windows.  Fix???

These make it hard to input HEX on Compose² x
	xcap xcup xdtri xcirc Xfr xfr