The union doesn't have to encourage them. They should encourage flying safely.

How are those illegal work actions? Since when is following the FOM/CFM illegal work actions?

"Writing everything up" - Flying around with inop equipment is a violation waiting to happen.

"not blocking out until getting cargo slip." FOM specifically states you need cargo slip before closing the door.

"run the APU" - Safety issue, generator redundancy, bleed misconfig.

"taxi slowly" - Safety issue, look at all the runoffs.
"not calling ops for numbers" - Sit in the penalty box until ground crew/load control does their job.
"if you need to burn off fuel do it at idle" - FOM states taxi with no more than 35% N1, to avoid FOD ingestion.