If it has a residual computer module drawing a few watts - unplug it.
With the right pellet you you can, But it should be a hunting Pellet (Hollow-point) and it should be a heavy pellet not a light weight pellet with at least 900 to1000 FPS.
the proper size
Any pellet gun should be handled like a real firearm. Yes you can be killed with a pellet gun under the right circumstances.
During purple pellet pooping bunny season. ;0
Depends on the pellet gun, the distance, and the game laws where you live. Most pellet guns should not be used to hunt anything bigger than a squirrel. They do not have enough energy for a humane kill.
The amount of ash produced during combustion relative to the amount of fuel fed into the wood pellet stove. Ash content is one indicator of quality for wood pellet fuel. Ash content for wood pellets should be between one and three percent. 

For us to answer, you would have to define "better". I can target shoot at 50-100 meters with a .22 target rifle, and I can't do that with a pellet gun. But I can target shoot in my basement during bad weather with a pellet gun- and I can't do that with my .22s.
Not normally unless you are using the wrong size pellet. Example: you have a .20 caliber rifle and you put in a .177 caliber pellet. Then Yes it will fall out. Check the barrel of the rifle and see what size pellet it uses
The dome pellet is considered to be the universal pellet.
More pellet.
No- but PEOPLE can USE them in a dangerous manner. A pellet gun CAN produce injuries, or in rare cases, death. They are not toys, should not be treated as toys, and should be used by people that are mature enough to use them in a responsible manner.
if you don't fire at cars and stuff, you should be OK. I fire my pellet gun often and never had a problem. So it's OK to buy one, just follow safety regulations and you should be fine.