I always play with the MAIN WGT page closed. All I have open is the game page. If I can play like that and WGT still notify me when friends come and go or at the end of the game give me an option to send a challenge to my friends for xp points, surely they can remind me at the end of a round that i have an unnamed replay to take care of.
after the game, go to your profile and name the saved play or plays. if you don't save those within 30minutes or 24hours(whatever), then WGT simply dumps the replay and you can no longer save it.
I would leave the emailing out. that would put more on WGT's end. At least my way, the onus would be on me. If i've already saved 10 replays before a game starts, then I save my 11th replay during that game, i'll have to delete one and blah, blah like we already have to do. The code is "practically" already there...it just needs a bow put on it. lol