Change behaviour of the modifier keys system-wide

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http://unix.stackexchange.com – I’d want to make modifier keys (control, alt, shift, meta, super, lv3_switch) to act like usual keys, I mean, without holding one of them to perform associated key combination. Say C-x M-1 can by typed like press Ctrl key — release Ctrl key press x key — release x key press Meta key — release Meta key press 1 key — release 1 key so that can be performed even with one hand key-by-key! (HowTos)