No. Like my reply says, it was just my understanding it was required. Refusing to sign is not hard to deduce that DOT will assume you have not received the training and you are therefore not qualified to drive till you do.
Having survived 37 years myself I can deduce signing is not the end of the world. I can also say that the one guy we had who refused to sign anything no longer works here.
No one ever got fired for refusing to sign anything. Youse guys wondering if we comply with what they're trying to get us to sign sound like the people who defend the government spying on us. Those people love to say--ignorantly, I might add--if you've got nothing to hide, you shouldn't care if the government spies on you. Or, if you prefer, the right to remain silent. Any attorney worth their salt will tell you to never--NEVER--talk to the cops without an attorney, no matter how innocent you are.
Same concept goes here. Just because you don't sign doesn't mean you don't comply with their rules, provided they aren't against the contract. It just means you aren't going to give them any ammunition to use against you.
FWIW, I ALWAYS insist on a copy of anything they are trying to make us sign. You'd be surprised how often it is used to correct supervisors who forget their own rules.