I've seen Bd6 in similar positions, I believe you that it's good
I'm surprised you call h6 and a6 waiting moves, I liked them and think they're useful, especially with the knight on a3. Then you play Qd7 and have a very comfortable position. White freaks out and drops a piece just 3 moves later :)
In my tournament I have come across the scotch gambit (i think thats what its called), and defended accurately for about 15 moves, and ended up winning..
My opponent played weak attacking-wise, and If he had played more aggresively, would have he achieved anything?
heres the game, im black (obviously)
EDIT: This guy ends up winning the tourney :(
After this game my opponent thought he was way better when i played Bd6, and i told him, you didnt play aggresively, you allowed me to develope calmly and take control of the game,
So then in round 6 he played the same opening! I was on board 1 and he was on board 2, i looked at him and smiled because it was funny that he was gonna try it again.. but this time he was prepared.. but his opponent blunders!!