I know it's early days and all... and I'm probably thinking way too much this early on in development...
I've been thinking of ways to control the UDR56K-4 without having a PC connected.
Would the processor in the radio be powerful enough to drive a USB connected touch screen... something like the Mimo Monitors products?
A very functional but simple control system could be quite easy to come up with that works on a small LCD screen.
Just an idea...