Yes, it is possible, but as of now I have no plans to do so.
Please feel free to modify it for your own usage if you prefer. I really only make mods that I am using and need, if I dont see a need I wont post a mod for it.
Adding the other bars really is not too hard tho, and should not take you more than a couple of hours to learn the program and tinker aound with my mod before you will have a finished window to suit your needs.
If I start a pet class later on down the road I may very well make the change myself, I donno.