I would like to make a bind to Ctrl Key for snapping on/off. When I press Ctrl - snapping should be toggled on/off. Is it possible to make?
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Unfortunately, you can't use solely a modifier for a shortcut, plus there already is a shortcut to toggle this: Shift + Tab.
If you still want to, you can change this in the User Preferences.
If you open the user preferences with Ctrl + Alt + U, and switch to the Input tab, you can search by shortcut (Click the dropdown next to the search box and select Key-Binding) to find entries containing "shift tab":
Now, find the entry under 3D view:
And press where it says Shift Tab and press the keys you want to bind.