My only concern with the date/time thing is crossposts failing because of it, though I imagine that'll happen infrequently enough that Support can handle it when it does. (The "you can't crosspost this because there is an entry newer than it already crossposted" error might need to mention that this might be a reason why this happened, if it doesn't already; I haven't seen the error in a couple months so I don't remember if it does.)

Heading off to the redesign post to comment there about that :)