It's pretty easy to bumpfire a 10/22, especially with a light trigger.
If you use my "bump fire device", you can run a 10/22 bumped from the shoulder very very easily, and my way costs $5 in material, and has the added benefit of not changing your stock and the device can be used on ANY semi-auto....shotguns, pistols, you name it.
If you haven't seen one, it looks like this:
The specs for making one:
Vid of it in use, 5 round aimed bursts from an AR:
http://www.localnumber69.com/temp/Aimed_Shoulder_Fire.mpg
BTW, figuring out the ATF's ruling on legalities with full auto is rather easy. If you get more than 1 shot per SINGLE pull of the trigger, it's an MG. With the stock in question, any bump fire device, or crank device, this is clearly not the case as your finger does pull the trigger each and every time.
The shoestring/AK method was ruled an MG precisely because it violated this simple definition of full auto. One pull produced more than one shot.
Very simple.