It would be nice to adjust the rule set so that the standard -10 (breakage), +1
(good build), +1 (more tests) could be adjusted.

I would think you would want to allow an overall default, and then also a
per-project value. The rational for the per-project goes something like this.
A project with no tests only 'breaks' if you check in something that doesn't
compile and that should be fairly costly. A project with a large number of
tests and that demands 100% code coverage (ala Cobertura, or similar) can be
broken very easily simply by failing to check in tests that cover all
code-pathways - because 'the bar' (code coverage demands) is set so high, it
breaks much more frequently, but the penalty for breaking such a build should
not be as much. One size doesn't fit all.