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Hi Eric,
Yes for it to have mirror lock there would be another knob as well as the focuser. There has been some work done on using a long 1/4" bolt and spring that helps to lock the mirror in place. It screws into the mirror lock hole, as Tony said. Don't know how good it works though.
Mirror flop is a real problem if you want to image for longer than 2 minutes, and then it can vary a lot depending on the angle of the primary mirror when you are imaging.
As you know, to get the very faint objects you will be hoping to go 5 minutes and longer.
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