Looking at an iPega 9023 gave me an idea. The iPega 9023 attaches to the sides of a device and provides gaming controls on the sides; plus it includes a mechanism for adjusting to different device sizes.

Wibrain UMPCs and other UMPCs had an excellent split keyboard layout. This layout should be made into a bluetooth attachment with a mechanism similar to the Ipega 9023 so that it could adjust to multiple device sizes. Such a device would provide keys on both sides of the phone or tablet. Maybe a touchpad could be included similar to the Wibrain umpcs