Yes, and no.
Below is the reason why and the methodology. I was hoping it would be rather obvious.
Currently when you choose the "Show Constraints" button it stays on (as its supposed to). You have to go back and turn it off. It can be an annoying process when you forget you left it on. Also if you highlight one or more entities and click on the "Show Constraints" button, it ignores the pre-chosen entity or entities. You have to pick them again. Once you exit the command the previously highlighted entities return highlighted.
The Wishlist idea is to click on an entity or entities and RMB to show the context menu. Then by choosing "Show Constraints" it would show the contraints for the already highlighted entity or entities.
I could also see the benefit of including "Show Constraints" in the context menu when nothing is selected. This would be an faster way to toggle it on and off.
Pete