I'll be giving the unit a go very soon. We'll probably have to develop some additional tunes once the 1270 cc kit and cams are completed.
I've always been a PC and dyno tune man as well but this does interest me.Flash tunes are derived directly from data acquired from dyno tuning and data logging. So there's really no difference from hand held flash tool loading to loading from a laptop from a dyno database, just the different delivery method. Both are similar as in the; Rexxer and the OE Tuning unit.
Yes, aftermarket big bore kits and cams have been available this particular series motor for a while. Big Bore kits are motor series specific not model specific. Yes, it will void any warranty.
No, aftermarket flash tuning the ECU will generally void your warranty if the dealer finds out or knows you have. However with a flash tuner, you can download and save the OEM tune then re-flash upload the OEM tune before you take in for service. No harm no foul so to speak.
No, there will never be a BMW OEM ECM flash tune made available for a big bore aftermarket kit directly from BMW.
One word of note; when BMW updates your tune during service intervals, it's done with a hand held flash unit similar to the unit specified above but is specific for BMW use only.