Hey Jeff, I recently bought the RPi Keyboard Hub (Pictured in OP and In parent blog) for its soft keys (Got bone issues), I was pleasantly surprised with the quality. I use Wacom Touch Tablet for trackpad along with a Steel series mouse in its Hub; But I'm worried about saturating the bandwidth as it's just USB 2.0 although I haven't found any conclusive issues.

Have you tested the Keyboard hub's limits? Controller seems to be QinHeng Electronics USB-Serial.