AutoBG is an addon that will do what I want.

/autobg marks -- queues for the bg with the lowest mark total
/autobg daily -- toggles queuing for the bg daily first if you have that quest

Can turn on specific bg's or not.
It will also auto-leave a bg as well.
Can toggle whether to queue as a group or not.

Very nice, I just keep playing and don't bother with open that window, selecting the tab, selecting the bg (after doing the same to find my marks).

Also a good example of manipulating a hidden window.