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Is there any way to let the Shift, Ctrl and Alt keys behave as toggles under X? I know how one could do it under CLI (for example, by doing this) but found no reference for doing so under X.

Please note that this is not a question on sticky keys, which can be enabled by an accessibility option.

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Depends on what you are toggling for that would make a difference of the process. –  Casey Keller Oct 13 '10 at 4:11
    
@Casey Couldn't it be like caps lock (whose ON/OFF states are irrespective of incoming keys or mouse actions)? –  Gödel Oct 13 '10 at 6:22

2 Answers 2

This is implemented on the DE level AFAIK. KDE has the option to Lock Sticky Keys:

With Lock Sticky Keys enabled:

If you press the Shift key twice then press the F key, the computer interprets this as Shift+F. Now if you type a P, the computer interprets this as the letter P (Shift+P). To de-select the Shift key, press it again.

http://docs.kde.org/stable/en/kdebase-workspace/kcontrol/kcmaccess/index.html

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That's a good answer for KDE users, though it isn't for GNOME users like myself. –  Gödel Oct 18 '10 at 21:04

Keys in X11 are remapped with xmodmap, but there is no Control_Lock in /usr/include/X11/keysymdef.h

If you have a few keys you could map Control to something like ISO_Next_Group_Lock and define your keys in this group with Control + Key.

I found some info here: https://bbs.archlinux.org/viewtopic.php?id=75771

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