When you get the book, you will see that she does not advocate a complete conversion to combined knitting. Instead, she suggests using it in certain circumstances -- such as ribbing or flat stockinette -- where it's practical and feasible, and gives a better result than continental or english. To be honest, I found the book a bit disappointing, and actually think grumperina's chart is more helpful in spelling out how to do specific things such as increases and decreases. (Even that has it's limits, though; you can search for some old threads on the topic.)
For those times when you don't know how to do something in combined, I think that the simplest solution is to just re-position the stitch as necessary (so it's mounted "correctly") and then proceed as you would if you were using continental.
There is no right way to knit; there is no wrong way to knit. So if anybody kindly tells you that what you are doing is "wrong," don't take umbrage; they mean well. Smile submissively, and listen, keeping your disagreement on an entirely mental level. They may be right, in this particular case, and even if not, they may drop off pieces of information which will come in very handy if you file them away carefully in your brain for future reference.