The title is 'AIM' ... So, I think it is a instant messenger
problem ... :-)
You mean the ability to convert the text between SC and TC ?
That's a very complicate task. And input method can not handle that.
I've tried many softwares, and now only one is satisfied me ( Running
on Windows,
http://www.speedy7.com/cn/stguru/english/index.html).
This software is very professional and the result quality is very well.