Glad to be of help. I didn't know that when I was first mucking around with "Jumpin' Jack Flash", so learning that really explained why my version of it sounded more like Ritchie Blackmore than Keith Richards. :-)

Actually altered and alternative tunings are really common in classic rock, with Neil Young, Led Zeppelin, Joni Mitchell and several others using them fairly often.

I also realized I forgot to mention what the tuning was, so here it is. The strings are low to high.

Open G = DGDGBD

Not sure what more I can give you right now that would be helpful instead of overwhelming. So good luck, and have fun!