> There's also value in doing one simple thing that adds convenience for users.
> I don't personally have any interest in building something as elaborate as the
> above, but I've used the simple idea here several times in different projects.

Yeah, I understand.  I totally see how Controller can be useful, moreover,
I've implemented something like it bunch of times (usually for running
tests).  But with Guido no longer actively involved with asyncio, and me
being the only one who is actively working on/supporting asyncio, I 
think we need to go through the full PEP process when we want to add 
new APIs.  bpo simply does not provide enough exposure: guys from
Twisted and Tornado, for instance, won't see this discussion.

I'd be glad to assist you with the PEP though!