Several of your questions, such as no. 3, would have benefitted from multiple answers, or ranking of answers. Slow play can be caused by a variety of things including the "idiots" answer, as well as the "wrong tees" answer.
There is a local course offering 'Fast play Fridays'. You agree to keep a pace of 3.5 hours in order to play. If you fail, you will be removed from the courses, and given a restricted time raincheck. You will not be allowed to play again on a Friday. Not only is the course filled on Fridays, but the pace of play is excellent.
More courses should have Pace of Play standards for critical tee times.