Hi there,
I was pretty confused by PTool to start but it is actually really rather simple. The file you download seta.ini needs to be in the same folder. It makes the A button at the bottom of the PTool window green. If it is green and you press it, it then sets all the setting for you.
Yes, I did this but there is absolutely no indication in ptool that anything has actually happened. So I don't know if the new firmware settings have been loaded or not and I'm not willing to load unknown firmware into my GH1 in the off chance that it is actually OK. So I'll maybve go down the manual route and type each setting in individually.