Just to let you all know, I have managed to program all the soundfields from the Sony DA50ES.
Once you get the technique down it really isn't that hard, although I still can't manage it reliably without first learning through my Denon remote control. [And I still consider this to be a great failure of the TC, which shouldn't really take this amount of work to fix]
I would imagine that any other learning remote will be able to achieve the same results.
I'm now looking to proove that you can "hack" these codes into the TC's PC file, so anyone out there with a DA50ES that want's to experiment please get in touch...
I'm in the UK, so don't get annoyed if I don't answer you guys from accross the pond too quickly...