OK, so I bought a VAG-COM cable so I could tweak my motor. I think I've done as much as I need to at the moment.
Was thinking that, as I have got a little Asus netbook all loaded up and in the glovebox, maybe I could rent the package out to people so they can do their own fiddling and coding. I'll do a 50/50 split with donations to the forum and to me. (Asus has clean Windows XP and just VAG-COM, so you just need a USB stick if you want to copy output or screenshots.)
This would be a massive "trust" thing, but if people are interested, then do let me know. I have no idea about cost or rental timeframe, so ideas welcome.