Halfdeck - 5:17 am on May 29, 2007 (gmt 0)

"I've never heard points 2 + 3 being relevant for pages falling into the supplementals."

As for 2) think of total PageRank X (sum of all inbound PageRank to your domain) split between Y number of pages. Roughly speaking, bigger page count = lower average PageRank per page (depending on your site structure). We know that a page with PageRank below minimum threshold "goes" supplemental. With excessively high page count, average falls too low, and you'll end up with many pages in the supplemental index. By reducing the number of pages, you slightly increase average PageRank per url. That can result in several supp pages popping back into the main index.

3) A minor point, but if a TBPR 5 page has 100 links and 90% of those are outbound, you are giving 90% of that page's juice to other sites instead of to your internal pages. Add more internal links to that page, lower your outbound percentage, and you have a little more juice to play with.

Both are minor tweaks compared to gaining trusted (non-paid, non-reciprocal) IBLs. No matter what you do, I don't see a domain with a TBPR 2 root getting 1,000 pages in the main index.