I just got my Rover 5 and had pulled the retaining bracket (metal L-brac with two screws inside the chassis) to pull the appendage out to set the height. I think it was an EE solution to a ME problem 
Unfortunately, if you have track slippage with the low profile mode, adjusting the height up will make it worse.
I have a composite eye (lots of IR) coming in next week to see how the Dagu demo will work. The DFR Romeo will be interesting in running the R5 Motor/Encoder Board (4motors/4encoders), (2) servos and (6) tactile buttons. I think there might be a 74HC595 chip and a dev board in there.
Thanks to Nick for opening this thread. I look forward to any further developments to this platform.
-George