1. My pain was usually worst in one knee.
2. The left knee.
3. Right-handed. The painful knee was opposite--but more to the point, my left (painful) leg is almost 1/2 inch shorter than my right (not too unusual, though most people don't realize it. This is why--no kidding--people lost in a forest without a compass almost always end up walking in circles).
4. I try to spin at about a 90 cadence, but usually end up a little short; and I try to "ankle" as described by Greg Lemonde--heel dipping down at the bottom of the stroke, etc. This adds a lot to my comfort WHEN I THINK TO DO IT.
6. Yes. Getting the seat height just right for me (which is not necessarily what the books recommend!) and the seat absolutely level in the MIDDLE of it (not the nose, not the tail) are the two really important adjustments that help me.
7. See (4) above. I average 10 to 10.5 miles per hour, actual moving time, in city traffic. OK, but I get there.
8. I'm 5'9" (175.26 cm) tall. It's about average for me.
9. When I was commuting daily, I rode at least 10.4 miles per day, and usually 30 to 60 miles on the weekends. I'm starting in again after a long layoff so present figures don't mean much.
10. Short hops and commuting, with a few 20-30 mile trips thrown in.
11. Cycling in a "real" way since 1991, with two layoffs. Thirteen thousand city-street commuter miles, which means about 650,000 broken beer bottles under my tires.
12. I would feel the knee pain most often after a longish ride, or anytime I had failed to get the seat height and levelness just right.
Pete, I should be using some kind of shim to raise the left foot, but it's all so complicated and potentially expensive I just have never even tried. I get by OK with the adjustments I mentioned.
I have had to use an elastic (Ace-type) bandage on my knee many times. I've also had to use elastic bandage or that miraculous self-adhering "sports tape" (spongy fabric that stretches and sticks only to itself) on my ankle(s) various times.
I hope some of this helps your research.