> Python 2.7 and 3.2: force sys.platform to 'linux2'?
-0.  I dislike this change for stable releases, but it’s a small change that would help a lot of users.  I think the release managers would need to approve such a change.

> Python 3.3: change sys.platform to 'linux'?
+1!

> Python 3.3: if point (2) is accepted, add a new variable providing
> more information about the build platform
-0.

BTW, your tallies are wrong: a +0 is more supportive than a -0, but your additions don’t show that.  :)