I’m starting to agree that reclassifying and moving them to a
different category whenever they appear is the best available
option, even though that doesn’t do much to prevent the initial
posts from landing in the inboxes of people who rely on E-mail for
this forum.
I suppose something else that might reduce the nascent post volume
in Ideas and also soften the blow of inevitable reclassification to
Help could be to expand the pinned post in Ideas with guidance along
the lines of:
“IMPORTANT: The Ideas category is for serious proposals about
improving the Python language, CPython interpreter or its standard
library. Thoroughly research prior proposals and consider the
feedback they’ve received rather than repeating the same or similar
ones. If you lack the time and skill to (perhaps with some
assistance) follow your idea up with a formal PEP and supply the
bulk of any eventual implementation yourself, please discuss it
elsewhere instead. Your post will get flagged off-topic and
moderators will move your post to the Help category when this does
not appear to be the case, so it may be best to just start there.”