Weekday Wonderings: Additives for commercial hand soap that will be less drying?

In this post, Handsoap with polyquats, Will asked: I love the weird question, and I think I have one. To a commercial handsoap, such as softsoap, is there any additive(s) that can be added into the product to make it less drying/more skin friendly? Yes, there are loads of things you can do to a commercial handsoap,…