You know what's weird? The code is already there. You just cant enable it for the other sides. I needed like 2 minutes to enable it for the left and right side, using the Counter Edge Visibility. If you wish you can download it from the link below.
PS: I didn't link the back edge, but that can be achieved just as easily.
Thank you, @Claudiu Serban. I downloaded the file, but I can only change the profile of the front edge still. I wonder what am I doing wrong? That said, would you be willing to share what line(s) of code did you actually change? Teaching a man to fish... that sort of thing!
Did you check the edge visibility? that's how you turn them on!
Make sure the sides are checked and it will apply the profile for them as well.
About the code, its a bit odd as the object calls a macro (KitchenGeneralMacro), that calls another macro (KitchenCounterMacro), and that calls yet another macro (KitchenCounterTopMacro).
This is where you must work, but you need to modify them all to call your modified version (thats why its a library, not a single gsm file)
As you can see, they were always 0, with no way to control them. I just linked them to the counter edge visibility, as most probably if you want it seen, it's an open edge.
Here is the updated version, with full control all on 4 sides.