RE: Multi Engine set-up question
Castle Creation's Scribe publication has a good guide to setting up dual brushless power systems. Check out pages 2 & 3 of the link below:
[link=http://www.castlecreations.com/media/castle_scribe_archives/Castle%20Scribe%20CE-03-Mar2006.pdf]Castle Scribe March 2006[/link]
Below is a graphic from that article summarizing what they recommend: