Ah, fresh ideas I never thought of myself.
There is unfortunately no "fix" for mirror flop. The mirror is mounted on a base plate that is in turn geared to the focusing knob, so the whole mirror moves up and down. I think a faster focusing-mechanism should help! 
It takes about 30 second for one revolution...
I am also toying with adding a wheel to a pot that can run on the shaft, but a mechanical connection like this may make it too much of a hassle, especially when the dew builds up...
Speaking of which. I have build a PWM dew controller, which I plan to hook up so the Arduino reads temp sensors and control the amount of power automatically. Then do some focusing control etc. and when I grew up, I will try and build a wireless (infrared) controller to focus my scope with. When I glue the Arduino to my scope, I don't want it just to blink and LED! It should work for a living. There is a GPS module in the scope mount... wonder if I can access that...
Keep the ideas coming!