It has been happening here for 2 to 3 years in our center. They had 50 plus RCPDs come in right before peak started. A lot of guys caved and switched their schedules to Tues-Sat with our local allowing the switch. Now after peak it has gone back to normal for the most part.
TLDR: the company resorting to termination over forced 6 punches is their "nuclear" option. It's a threat they're not likely to press. Show up for your regular 5 day schedule, follow the methods, and don't lose sleep over their threats.
My local also allowed that side deal, just after peak. Forced 6 punches have been going on ever since Sat delivery started in my center. Last summer was the first time they dared to base attendance discipline on it. We had a few pending terms, but the company didn't even raise them at locals, let alone compel those drivers to fight for their jobs at panel.
The way I've looked at it is this: regardless of the contract (where, even here in the Central Region, I don't think the company has an air-tight case), if the company is resorting to discipline to cover Sat delivery, they're already showing weakness. They're short-handed on Sat. Their attempts to "force," which already imply threats to our jobs, aren't working. The only way discipline
might work is if they risked taking 6 punch cases to panel and won. If they lost, their threat would be null and void. And even if they risked and won, who knows, there could be mutiny in the ranks. Needless to say even the die-hard paper-chasers get tired of doing deliveries 6 days a week, let alone low-seniority RPCDs still in progression who, in my experience, usually aren't interested in sacrificing their weekends. We had several quites last year due to forced 6 punches -- including drivers trying to qualify.
The weekend is sacred. The company might succeed in chipping away at it here and there, but once they meet serious resistance from reliable employees, terminations are only going to aggravate their staffing problem and they know it.
I will say, in my center we must've made an impression. A couple weeks ago we had severe winter weather and EC'd a mountain of volume Thurs and Fri. Center manager didn't force a soul. Several Sat routes were dispatched over 200 stops. Roads still weren't great so enough volume was rolled on to Monday to send plenty of our routes, including mine, up to spring/summer 2020 stop counts.