This will change when it gets busy. BTMRR FP machines only operate when crowds are large. That why it's been weekends only since the Holidays, but will probably be all week the week of President's Day and for Spring Break.
The BTRMRR FP has been connected since the Holidays, it has been confirmed many times since then.
"Connected" is a term used to describe that having a FP from one attraction in Disneyland Park, will not let you get one at another attraction in the same park until the return window opens or 2 hours later, which even happens first.