If you haven't already, watch this series of videos by Scot Nelson. Very informative and will give you a much better sense of how bananas are grown commercially. They definitely limit the number of suckers.
I took "sister shoot" to mean a pup that forms when the main stem is very small and is about the same size as the main stem. I don't think they are a real problem, just inconvenient for commercial production. What you would do for commercial production isn't necessarily the same thing you would need or want to do in your own yard. For example, Gabe has suggested for home growing to let more pups grow, which spreads out fruit production over more of the year. Though good for home production (it's hard to eat 100+ bananas on a bunch in a short period of time), having more but smaller bunches is inefficient for commercial production.