Mod - Sims take off shoes to swim.

If you have Spa Day, you've probably noticed (or haven't) how sims take their shoes off automatically when they use the Yoga mat. I thought that's pretty cool, and I wonder if the same tuning can maybe be applied to the swimming interaction. So that we can use sandals or shoes with swimsuits and sims would walk around in them but take them off to swim.

Could someone who has Spa Day and some modding skills check out this behavior on the Yoga mat and see if it could potentially be a mod for swimming without shoes?