Basically I found that in the SCIM Global Setup I had Shift-Control-KeyRelease-Shift_L, Shift-Control-KeyRelease-Shift_R, Shift-Control-KeyRelease-Control_L, and Shift-Control-KeyRelease-Control_R defined. Removing these stops the Control-Shift trigger.
But I missed this even looking at the SCIM dialog multiple times because it looks more complex than a Shift-Control keypress
So although the Control-Shift in scim is incompatible with Ctrl-Shift-* shortcuts, I can disable it, so this isn't a problem for me know
Ah, my problem was misunderstanding the SCIM config
See http:// www.scim- im.org/ forums# nabble- td4554222|a4554222
Basically I found that in the SCIM Global Setup I had Shift-Control- KeyRelease- Shift_L, Shift-Control- KeyRelease- Shift_R, Shift-Control- KeyRelease- Control_ L, and Shift-Control- KeyRelease- Control_ R defined. Removing these stops the Control-Shift trigger.
But I missed this even looking at the SCIM dialog multiple times because it looks more complex than a Shift-Control keypress
So although the Control-Shift in scim is incompatible with Ctrl-Shift-* shortcuts, I can disable it, so this isn't a problem for me know