Input method cannot be used
PLEASE read FAQ first. You usually don't have a real bug.
Please also attach your ~/.config/fcitx/log/crash.log. And please make sure whether you can reproduce it or not. If you can reproduce it, please try remove your ~/.config/fcitx/, and other related data and try again, if not, please also attach your ~/.config/fcitx.
Some people might have some random ideas, but as developer we might not think it's useful, or it might bring more mess than an useful function. You can try develop it yourself. Think about it before you really ask.
By the way, the both fcitx and fcitx-dev maillist is also welcome for discussion, you can get your idea verified by developer and then submit it to issue list in order to make sure it won't be forgotten.