This feature would essentially be that the player can flag a specific item from a specific player in the ah and they will get log messages that will warn that player when the auction is about to end, or you could set it up to receive hourly messages or whatever.
Let's say you see a Wazzy in the ah sold by whoever and you're like hey that might be a good deal (since currently there is no max bid (in this case) and the current bid is pretty low), so you flag it. As the auction goes on, it would notify you at key intervals, could simply be when the hours remaining hits a binary number if that makes any sense? so like 1 hour, 2 hours, 4 hours, 8 hours and so on.
I really like this idea but some might not, let me know your opinion!