We're currently working on cleaning up the issues with remapping keyboards, and adding more keyboards, which may be somewhat slow. I incorporate user requests for features as long as they're reasonable. (Don't ask for a 3D graphics keyboard ``visualizer'' :)
And of course, the future brings the hope that I will ruthlessly eradicate any bug that I (or you) can find in GTKeyboard. As said, the redirection code is up for a rewrite, and when that happens, there may be some small issues to work out.