As long as your careful and are in a WIDE OPEN SPACE with no chance of fire or poking your eyes out (and don't run with scissors), Go for it!
Whatever you do, don't take a servo apart and use the two wires going to the motor as the power for your engine igniters so that you could ignite them with a switch on your radio which would, in essence, "activate" the servo but would really send the power to your igniters. Don't do that. (sarcastic tone laid on reallllllllyyyy thick). (nudge, nudge. wink, wink)
Mike