They should map both Control and Escape to Caps Lock. Control when combined with other key or held for longer than 250 ms, and Escape when pressed and released within 250 ms.
That's awesome, I had no idea you could do that. MacOS Sierra? Doesn't appear to be present in El Capitan Modifier keys - or is it a third party utility?
plenty of games use ESC in input options as an exit out of selection. "Press key to bind or ESC to cancel", with your solution I would end up with unwanted CTRL binds