For the Startup/Shutdown issue, it's possible that the Acceleration / Deceleration Rate needs to be adjusted via the Menu Button.
You can get there by:
Menu / Control / ACC RATE (or DEC RATE)
Factory Default for acceleration is 4 MPH/S per second, and 2 MPH/S for Deceleration.
Max setting for both is 25 MPH/S per second...
I run the Factory default on my engines and never really had a need to screw with the ACC or DEC rates, but it's probably worth a look in your case...