1. When you work with dpns you don't necessarily have to have the same number of stitches on each needle (unless your pattern tells you to and even then it may not be necessary but make it easier).
2. You may be able to do as you suggest, but it might be well to do what they say and remove the markers a bit later if you find you don't need them.
3. Yes, the needles may be like markers if the markers you would place are right at the end of each needle, but that may change.
What would you suggest?
I'd suggest you do what they say and move sts around to make it work. Keep the markers where they tell you for a while and if everything is working out so methodically that you feel certain you don't need them any more, take them out. I don't like markers either, they are a pain to have to move all the time, but sometimes make life easier.