There is a new TTL V3 board out for Nikon, see this:
Also 2 new ones for Canon.
I am still waiting for my Subtronics, they are not on the list of working uw flash systems....But, in manual mode it is possible to change power level on the camera menu system. I was even told by Subal (under Version 2 already) that they can build a switch into one of the free housing plugs (M14 threaded holes; I have 4 of them: 2 for the flash bulks and 2 are free) to change the power level by turning the switch, thus keeping the hands on the housing, which is interesting IMO. Anybody has experience / seen this?