Yes, the 4 custom points are in addition to F, C, B
I've had mine for 3 months, and I use it every week. I've only had to charge it once so far. If the battery starts to lose life in about a year, I don't see it needing a charge in the middle of a round. By the time the battery becomes a problem, I would have gotten my money's worth x2.
I usually clip mine on my right side (backswing side) and I've never had a problem with obstruction. Barely even notice it's there.