Michael,
The PowerExpander is our version of a unit to distribute power to the servos without relying on the receiver power bus. I know that JR and Futaba say the power bus of a receiver can handle 10A or more but the real issue is the single 22ga wire and connector that come into the reciever. As you know, Smart-Fly already uses double 22ga leads in their SuperSwitches and Regulators to supply power to receivers. This ups the current capability to around 6A for the two connectors. The PowerExpander uses a Deans' Ultra connector, as does the UltraReg, to get power into the unit. This connector can handle upwards of 30A. The unit itself is a little different that other units out there. The receiver sits on the unit and connects to the unit with short pigtails for each channel, up to 9 channels. The unit then takes these and buffers them and outputs them to either four servo connections per channel or two servo conections per channel, depending on the channel and its typical usage. All connections in and out of the PowerExpander are RF filtered. There are versions for JR and Futaba end-loading receivers. The unit filters and regulates power to the recever but passes the power input directly to the servos. This is why we are developing companion regulators to go with the unit. I will post a picture of the unit as soon as I can. This unit should be shipping by the end of October.
I will be out of town for the weekend so I will not be able to reply to more questions until Monday morning.
-Bob