The author has to give you permission within PAUSE. You can't just say "I'm updating your module". If the current maintainer is unreachable, then email modules@perl.org.
Note: If the current maintainer is reachable, but uncooperative, that's a different issue.
My criteria for good software:
- Does it work?
- Can someone else come in, make a change, and be reasonably certain no bugs were introduced?