[dcb]

re: cruise, probably the simplest is "on or off", with brake/throttle override. you select the speed you want to go with your foot and throw the switch. resume/accel/coast are all nice but they provide much diminished returns compared to an rpm lock switch.

re: mega 8, just spend $3 on an atmega 168 (or maybe 328) please? The cost difference is peanuts especially compared to the confusion and extra maintenance having cpu options causes.