I have been chatting extensively on my iPhone via text messages. I always have my phone on silent and the vibrations seem to really run down the battery. It's a waste because a lot of the time I have the person's text window open already and I don't need a non-visual alert. But if I have the phone locked in my pocket I want it. I assume the answer is no but is there any way to disable sounds or vibrations when the phone is unlocked? Even though Apple can be stingy with settings this seems like a worthwhile one to add doesn't it?