I tried them for awhile, but there was always just enough false positives to make it too intrusive for normal work flow, especially if you're normally a fast ty

I tried them for awhile, but there was always just enough false positives to make it too intrusive for normal work flow, especially if you're normally a fast typer. In the end, it was better to either just add more thumb keys in a custom layout, or eschew such clever shortcuts altogether when using a normal keyboard.