Smart Common Input Method platform

well, currently SCIM's key sequence of switching IMEs only works in this
way:
Press Ctrl -> Press Shift -> Release Shift -> Release Ctrl

and pressing in this way will not work:
Press Ctrl -> Press Shift -> Release Ctrl -> Release Shift

however, some Windows users tends to "strike" Ctrl and Shift keys together
to switch IMEs, which doesn't always work in SCIM if she happens to
released Ctrl first.

so I would suggest that make the 2nd method work as well :)

I'm not sure what you suggest to be done (if anything). Can you please
clarify?

never mind, setting to Shift+Control+Control_L combined with
Shift+Control+Shift_L worked.
I'll keep this open though, as I think it remains reasonable to support
such key sequences by default (and I think it's a user-experience issue
rather than a "Windows vs. Linux" debate ;D)