Two suggestions for bashing locks:
1) Give two handed weapons a bonus when bashing locks.
2) Give offhand attacks a penalty when bashing locks.
#1 is not a very important suggestion, because while a realistic idea (and follows damage patterns), it would take a retweak of bash DC's and wouldn't really regulate bashing, because everyone would start carrying around a spear or something.
#2, however, I think should definately be implemented. Offhand attacks recieve no penalty when bashing. I even set up a slot on my quickbar with dual wielded weapons so that I can bash things faster when I hit barbarian rage. I don't think it should be that way. It's an extra bash attempt with no strings attached.