Pocket Door stuck on the bottom

I installed double french doors to the master bedroom and haven't yet cut out the doorknob holes. Actually, I haven't fount what I wish to install. Theses are solid double wood doors, 1-3/8" thick. Here's what I would like to do: Get privacy doorknobs that latch to the head jamb instead of the side jambs. This way, they can latch independently of on another. I do not want to get an exterior-type bolt that locks the bottom and top on one door, and uses a standard lock and handle on the other door. I envision the convenience of opening or closing both doors simultaneously and quickly, but also locking them independently. I prefer to avoid a sliding bolt screwed to the outside. I don't mind routering a slot in the side of the door to install the mechanism. Does something like this exist? I haven't found one yet. Where can I buy them, and what would this arrangement be called?

Our windows have large amounts of water condensation which drips onto the sills as well as in the little tray that collects it. what can we do in our home to help prevent this? what can we do to our windows to lessen the condensation thanks