Chinese input doesn't work in 5.x and now the 6.0 beta 3 doesn't do it either.
In RT 5.x, you cannot type Chinese at all, simply won't accept it.
In RT 6.0 beta 3, you can type chinese after pressing the 'Enter' key, but if you want to select a character from the OSX IM dropdown list with the arrow key, nothing happens, so you cannot select the right character from the IM dropdown menu.
I've emailed Ragtime just now and lets see what they say about this.
Without the input problem solved, I cann use this software at all.
I will post review once this is solved.