For smoke, might want to look into this:
http://www.tmenet.com/products.htm#ssp
It already has the ability to interface with an R/C signal natively.
For general electronic switch needs, you could try these:
http://www3.towerhobbies.com/cgi-bin...P?&C=MBZ&V=EMO
They turn the radio pulse signals into actual switched outputs.
You can get servos that do not have a specific range of motion - they act as winches instead. Tower has some but not sure what they would be called...