I wouldn't really call it an exploit, atleast in my oppinion :P
Nevertheless, a pretty good trick though, could use it to port back and forth every hour, atleast in theory :P
Hearth to IF from SW, set hearth in SW
Run to IF inn an hour later, hearth to SW, set hearth back to IF
repeat
Not sure if it would work, but man if it did that would own for the little AH trips where you know you have to log out, you can just log in, hearth to your place, and be ready to go, and still be ready to AH whatever
I dont know, would be usefull even if i just rambled on about something that doesn't work