Could you elaborate on this? I use TKE in Vim mode every day and haven't run into issues with supported Vim motions. What motions did you try doing? Tcl/Tk is usually pretty difficult to crash.
I recall that there was an issue in Tk in regards to the wordstart/wordend index adjectives (which the 'b' command uses); however, I thought that was an issue with 8.5 version of Tk. What version of Tcl/Tk are you using? If you go to the About window within TKE, it will show which version is being used.
1. Opened TKE
2. Changed to insert mode
3. Typed some random characters
4. Pressed ESC
5. Press b
TKE crashed
I'm on Windows 10, recently fresh install.