Hi, I've just joined the forum too! Just acquired a 1.8T and loving it.
I hope I'm not stating the obvious (and shoot me down if I am lol), but you are aware that if you press the door open button on the drivers door controls it unlocks the boot aswell?
It's the same action you get when you double press the remote.
hope this helps, and if not let me just say hello to you all!

EDIT: re read your post and woops. I realise now you mean physically releasing the catch from within the boot. I had a quick look, are you liekly to be able to get the trim panel off the tail gati without opening the boot? You might be able to ping the mech if you can.