The biggest issue with the GXR A12 unit in the beginning was the focusing function. A few have totally no problem but most who use it complained about it. It wasn't about blurry pictures, it was a little trying when you watch the GXR hunting for focus on the beautiful high resolution view screen and your subject disappear out of sight.
Kudos to Ricoh engineers that they did not stop looking for a solution, but they were merely band-aid on a leaky wound. Then Firmware 1.29 arrived, it is a god-send. (But so very late for my last trip, arrgh!). It also made the beautiful view screen even better.
Running through the update, I came upon something interesting. This is strictly for the A12 50mm unit. Spot focusing now comes in 2 flavours: Normal and Pinpoint.
Normal is just normal. Pinpoint actually reduces the area of focus even further. This however slows focusing down, especially in non-macro mode. I think the purpose of this setting allows for very precise focusing in macro mode at the expense of speed. Coupled with adjustable targeting this would definitely help with macro work on tripod.