I thought I had a lit one somewhere......

That's contributing to the delinquency of a Minor, you should be ashamed...lol :)

Deducting from an employee's paycheck is a big no no.

(h)(1) Off duty. Except for time spent resting in a sleeper berth, a continuous line shall be drawn between the appropriate time markers to record the period(s) of time when the driver is not on duty, is not required to be in readiness to work, or is not under any responsibility for performing work.

He he yep...I've done that a few times when I was in laredo at the Werner terminal ,and drivers would put their locks on the glad hands to "save " themselves an empty while they camped at the Pilot ...only to come back and find their glad hands removed/swapped to a red tagged trailer .

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I don't know-- I kinda like the glad hand locks myself--- most thieves are too lazy to "work" a crescent wrench- and don't carry spare glad hands with them. And sure wouldn't hang around to repair the lines(if they broke them- while knocking off the lock) The enforcer kingpin lock-- is real easy to drill out the cam lock- then pry out the drawer lock and remove.
Same goes for those dash mounted air valve locks--- like you said-- just have 2 of the plastic valve covers(.99cent?? available inside the T/A shop)-- sure you might crack the plastic dash prying off the lock--but still- 5 minutes or less and you're down the road in a slightly damaged tractor.

In my opinion, yes off duty means that you have no responsibility to the truck. However, before going off duty you were on duty and had the responsibilty of parking the truck in a secure and legal place. If you slipped while climbing out of the truck while on an off duty restart would you tell the company they were not responsible for the medical bills?

pretty clear

(h)(1) Off duty. Except for time spent resting in a sleeper berth, a continuous line shall be drawn between the appropriate time markers to record the period(s) of time when the driver is not on duty, is not required to be in readiness to work, or is not under any responsibility for performing work.