Dan,
I believe there is something in the pipeline on the speedo front, you should hopefully hear something soon from the guys.
R/C the Stinger has great potential, I have all three cars and the Stinger responds quicker and has a better direction change than the R2 or R3. Some may describe it as twitchy, but its easy to dial in to a circuit. At least now that they have got the ackeman angles right the steering rack system isnt so much of a pain. Plenty of lock on the car now!!