Honestly even max size breasts aren't all that crazy in this game considering the races that have the larger chests are also the larger framed races like roes/highlanders etc. A butt slider of similar ranges I don't think would be 'over sexualization' any more than what we have now.

On a technical level I don't know if it's feasible for them to add a butt slider though. Either way, it would be nice to see options expanded regardless of if that particular request can be fulfilled. Give highlander men eyebrows you cowards.