There are two flavors -
Jedi Master (Based on T-Mo Stock Firmware) which has wi-fi calling enabled and working. It does not include multi-window. It does have the same tweaks and boosts that ALL Jedi ROMs have.
Jedi X (Based on AT&T LJ1 Firmware) which has multi-window enabled and working, but no wi-fi calling.
I'm not sure about what themes out there support your no battery graphic request, but I'm someone has one. Bear in mind that themes will need to be consistent with the 23-Toggle mod that is cooked in both flavors.
Also... I assume the AT&T LJ1 will work on the Tmobile version, yes?