I tested exception_pickling_25.diff, and it may break existing code.
In 2.5.1, Exception("Hello,4).__reduce__() gives 
(<type 'exceptions.Exception'>, ('Hello', 4))

With the patch, it gives

TypeError: can't pickle Exception objects

IMO, that is an unacceptable change for a bugfix release.

Aside: please give unique file names to the patches, or remove patches
if you want to replace a previous patch.