use CapsLock key as Ctrl and Esc

click = Esc
hold = Ctrl

motivation

• Esc → vim
• Ctrl → b/c the ThinkPad TrackPoint Keyboard II has it's Ctrl key in a weird palce

Xorg

• $ setxkbmap -option ctrl:nocaps
• $ xcape -e 'Control_L=Escape'
  • see xcape

MacOS

• use Karabiner Elements with this complex modification