I have released tmplugin that supports CJK input. http://hetima.com/textmate/index-e.html
It detects input mode correctly. No action to activate required. I have tested only Japanese. But it will works with other language that uses Input Method as well.
There is a side effect installing CJKinput. I guess it is only related to non US keyboards. If I type e.g. tilde by pressing option+n, or ´ to enter e.g. é etc. CJKinput also comes up. It works in that case also perfectly. It just needs getting used to.
Cheers,
Hans
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