Dual‐role key

Resources

• forum thread https://geekhack.org/index.php?topic=41685.0
• https://en.wikipedia.org/wiki/Modifier_key#Dual-role_keys

Implementations

• TouchCursor [WIN] (http://touchcursor.sourceforge.net/)
• xcape[X11] (https://github.com/alols/xcape)
• lydell's dual[AHK] (https://github.com/lydell/dual)
• BigCtrl[AHK] (https://github.com/benhansenslc/BigCtrl)
• Space 2 Control[X11] (https://github.com/r0adrunner/Space2Ctrl)
• At home modifier[X11] (https://gitorious.org/at-home-modifier/pages/Home)
• KarabinerMac - https://pqrs.org/osx/karabiner/xml.html.en#syntax-__KeyOverlaidModifier__ KeyOverlaidModifier
• keydoubleX11
• tmk firmware Tapping[AVR] (https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#4-tapping)
• evdev-spacefn[X11/evdev] (http://www.ljosa.com/~ljosa/software/spacefn-xorg/ https://geekhack.org/index.php?topic=51069.msg2540818#msg2540818)

Matias half keyboard

• One-Handed Touch-Typing on a QWERTY Keyboard, Edgar Matias 1996
• Matias half keyboard
• http://geekhack.org/index.php?topic=41685.msg1105565#msg1105565

Use cases

• SpaceFN layout - suggested by spiceBar http://geekhack.org/index.php?topic=51069.0
• Shift/Space on Space - known as SandS in Japan
• Control/Backspace on Caps Lock
• Control/Esc on Caps Lock http://stevelosh.com/blog/2012/10/a-modern-space-cadet/#controlescape
• (/LShift and )/RShift http://stevelosh.com/blog/2012/10/a-modern-space-cadet/#shift-parentheses
• Modifers on home row