I believe the rule is, if you putt your ball and it strikes my ball, then it's a penalty on me.Nobody wants to distract someone but you can't guarantee it. Shoes squeak, you can accidentally drop your putter or ball, all kinds of stuff you can do can interrupt someone. Just stay still and let someone putt. If you want to move around fine but if you bother someone then hopefully they will tell you instead of stewing on it.
Your second point about not marking your ball. If my ball hits your ball then it is a penalty (provided I putt the ball from the green). Why would I give myself another way to lose strokes, doesn't make sense.