Making the home work policy known
This should really already be the case. Anecdotally I think that we are doing this quite well, but if there are cases where it isn't being done, please do do it.
Offering a hint.
If you really want to, that's probably fine. It does already happen somewhat regularly. But please use comments, not answers.
As Jon mentioned, chat is an excellent alternative that allows for the back-and-forth which we generally don't like on main site. We are a bit more lenient with the long comment chains here, but that's not an excuse to do it all the time.
Not voting to close a question until three days have passed to give the OP time to expand the post.
I don't really agree with this; OP can still edit the question when closed, and besides, the three-day wait is impractical to enforce.