I've been meaning to bring this up for some time.
A teammate suggested the idea of enabling comments to side control awhile ago. I'll admit that I've toyed with the idea more than once over the past five-odd years. But in the end, it's always been simpler to stick with the comment-free status quo. As in jiu jitsu, it is often easier to be the immovable object than it is to be the irresistible force.
That said, there is a specific goal - a milestone, if you will - that I was reminded of in the heat of training on Monday that would more than serve as an appropriate opportunity to have more voices on side control than my own.