Is it easier to perhaps get it added to 1.3.0 or 1.3.1 or something? If you've got all the codes ready, it is probably just easier to put it in the new script.

I'd have to pick all my code apart to find the parts of code that go with the tabs. Probably be easier just for someone else to code it for you.

Well this is a tough decision you have to make with a highly customized site. You will find it difficult or even impossible to go with official updates, and if so you will have to upgrade manually or ask someone else to do it for you.