How To: Enhancements to CORE DUE libraries?

Hello,
just to ask, if there is a formal process, how to request/discuss enhancements to the CORE libraries?
I made a suggestion about watchdog-handling in this thread: DUE Watchdog usage - Arduino Due - Arduino Forum, where I received no response. Perhaps because the subject of that thread was not so clear as it should be.

Thanks for any hints, links, advices!