I suggest to put this in the devguide and deep-link there from the python-ideas (and python-dev?) description. The more we have under version control the better. There shouldn't be a need for too much bikeshedding on the first iteration -- just get a simple PR (along the lines of what you wrote) up (you can ping me for review) and once it's merged you can link to it; we can then easily iterate on the contents if there seems to be a need for additional suggestions.