OK, I am going to teach yall something about unit groupings, modifying the unit groupings is kind of a pain in the ass. Since alot of this is preset in the UI, it is really hard to expand the number of unit groupings. On top of this, the unit groupings xml file is set to standalone and will basically override any changes you try to make in a very bizarre way. The best way to mod this functionality is to directly modify the core file, which I know is not good for realeasable mods.
EDIT: After talking with Cari_Elf, I have been informed that some parts of the system do not check adequately for updates. I had previously believed that the standalone tag was the reason, but nope just some wackiness.