Disclaimer: Pie in the sky. Lots of it. Bring a bib.
I have an idea RE: Q#7, but it requires backend coding to aid in "training" the user. SE is likely to resist this approach due to the unique features it would entail us having compared to other sites, but here we go anyway. Deploying pipe dream:
- Reading documentation about this page's targeted subject matter provide a user with very, very small amounts of +rep.
- The site-wide +100 rep is ignored for SF's rep calculations.
- Users below 10 rep cannot post questions.
The end result is that questions can't be asked without reading about the subject matter first. Supplying a 1 or 2 good answers bypasses this obviously, but that's not a bad thing.
If I really want to crank up the pipe dream, we might allow the +100 cross-site rep if the user meets a minimum rep (say, 1000) on certain sister sites to SF (Unix.SE, SU, etc.), but I'm stretching things enough with inane feature requests as it is. SO would not be one of those sites.
Yes, I know suggestions like this are generally terrible and unlikely to be implemented. I would not be suggesting it if I did not feel strongly that this would go a long way toward modeling the correct user behavior and reducing # of bad questions.