i found e.g. this keychain-led-torch:could this work?
just found this http://www.genius-versand.de/shop/product_info.php?ad=pr&products_id=19269
If you're feeling gutsy, I found making a wireless remote control not too difficult. I had seen the instructions Fingalo had posted for his wireless setup. I couldn't find the hardware. Instead, I stopped at the toy store and picked up a $20 remote controlled car. Specifically found one which took AA batteries because I didn't want to deal with recharging issues. When I took the car apart, I found everything was embedded on one circuit board. Plus, the voltage going to the motors was just under 5 volts (4.5v and 3v, roughly). I wired one set of wires that went to the motor to a usb cable and the to the camera. It works great. For something like this, I highly recommend using a multimeter to check the polarity and voltages to make sure everything is in range.