Ran this one past the girlfriend (aviation law student) and she says as per FAR 1.1 that the airplane has to be moved under it's own power and stop after a landing for it to be considered flight time. So since it moved under its own power with the intent of flight condition one is met, but since you didn't land the airplane condition two is not met therefore it's not legal.

Personally I don't think the fed's would care about a spare .3 hours in your logbook; but I'm gonna agree with the don't log it crowd and especally if you're considering airline or the like. It would seriously suck to be sitting in the interview room and have the cheif pilot point at that entry and go "So this .3 hours, tell me about that." Not worth the hassle in my opinion.