Glad you like the Blackstar Doug!
They have great engineers but I think their marketing department is operating with one brain cell to share among all of them. I'm told the TVP button is there so the sales drone can demo it to customers.
My buddy modded his ID15 to have an output jack and hooked it up to a 4x12 cab...it kicks ass. And it's a damned sight cheaper than the Blackstar TVP head unit.
Keep an eye out for firmware updates. They seem to be adding features now and then.