Enable some terminal keyboard shortcuts.
See terminal specific info below for shortcuts that are affected.
Enables or Disables usage of shift-ins to insert text from system clipboard.
Enables or Disables usage of larger-vt-font and smaller-vt-font (usually bound to shift + ctrl + KP-Add, shift + KP-Add, shift + KP_Subtract.
Does not allow applications to use these shortcuts even when terminal actions are disabled.