Yes, blocking the sidewalk is illegal and if it is over the sidewalk it is not legally parked in your driveway.
If you are talking about a driveway other than your own, you can park as close to it as you want as long as you are not blocking it and if the law permits (although I highly doubt that would be illegal, you know how some are). For a piece of advice and courtesy though, allow at least a 4 inch space between your car and their driveway.
Yes it is illegal because it it vandalism.
Only onto a major road or junction, or by a local ordinance. Otherwise we would all have a U shaped driveway. You need a turn-around area in your driveway. It certainly is not safe to come to a stop on the highway and back into your driveway nor is it safe to back out of your driveway onto the highway. I have a straight driveway and it's not illegal to back out onto a minor residential street.
It is not an offence to back out of a driveway, but it is an offence to back across a lane of traffic.
no
Obstructing a driveway, service access, etc. is generally illegal anywhere.
No its not illegal to have it parked out of motion but if you were to be driving then yes it is
It could be deemed as trespassing, which is illegal.
yes
It is extremely rude, but since he owns the property, not illegal, unless you are paying a surcharge to park.
no