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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!

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The term you are looking for is "sticky keys". A similar question has been asked on superuser: use xbset sticky -twokey -latchlock. – donothingsuccessfully Feb 8 '13 at 8:50
@donothingsuccessfully thanks, but fix xbset to xkbset? Someone may not get it. – tijagi Feb 8 '13 at 23:51
I just lazily copied the command from the superuser link! Now my previous comment is outside the edit window. It looks like the real command is: xkbset sticky -twokey -latchlock. – donothingsuccessfully Feb 9 '13 at 7:54

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