Let's make this a bit clearer for you. Please note I am speaking from a USA legal perspective however I am fairly sure Canada is similar.
If you are in the operators seat of a motor vehicle with the engine running, you are considered the operator of said vehicle. If you are on public property you can be cited as the vehicle operator. Operator of a vehicle on non-public lands is applicable when it comes to insurance claims, police reports, and court cases.
Had a member of the Arizona Sheriff's Office (and later my lawyer) make that very clear.
This has been expanded to include human powered vehicles (cycles) however that varies by State.
It has been a few years since I have driven in either Toronto or Montreal but at that time these same rules applied.
As for ticket quotas or similar events, I have no direct knowledge of this. I suspect the "line" exists where the LEO, Judge, and your lawyer conclude they reside.
Yeah... while other readers will appreciate your comments - because they are spot on - I'm not sure who's not being clear. I don't disagree with you. In any way.
The challenge is that laws regulating driving were, are and should be intended to create a common framework of behavior with the goal of protecting the public. That means protecting you from my actions... and me from yours. Those laws should never penalize me for your actions, nor you for mine. Even in 'no fault' states, that term usually applies only to how insurance is adjusted. A driver can still be cited for failing to follow the law.
We good?
OK... now let's delve in those pesky details I keep pointing out. Rules that are written with vague, indeterminate language provide wiggle room for interpretation, and our LEO's at all levels have a long history of taking full advantage of that. I'm not in any way disparaging a single individual. Rather, I am pointing at the systemic use of those Rules to control behavior that does not and cannot create an unsafe scenario. Regardless of why, the net impact is that LEO's - particularly those that generate any revenue through a systems of fines - end up with a handful of common things they can use to increase revenue. Intentionally or not. Those things that generate the most revenue are also likely to be the easiest to identify and the easiest to prove in court... regardless of underlying factors.
Let's change scenarios and take a fresh look:
Someone is drunk and realizes that driving is not safe. So... they go sit in their vehicle to sleep it off. Parked on private property. At least in Texas (and several other states where I have direct knowledge) if you so much as have the keys in the vehicle you can be charged with DUI. The vehicle doesn't even have to be running.
Now, no one is suggesting that driving while under the influence of alcohol is even remotely smart.. and driving while under the influence of >x amount of alcohol is illegal... and dumb. If you do this, you deserve whatever you get.
Those laws were put in place to protect the public from an individuals actions... particularly actions known to have a high probability of causing harm. No one is disputing this.
With all that said, how is the drunk guy sitting in his car... sleeping off the effects... actually harming anyone? The answer is they are not. Trespassing? Possibly. Drunk in public? Maybe. But... Driving Under the Influence? Not if they are not driving! However, the fines for trespassing or drunk in public are usually not nearly as high as DUI, and the public (in general) likes statistics that show our LEO's a 'protecting us from all those drunks!"
See... when we start writing laws and don't keep in mind what behavior's we are trying to discourage or encourage we end up enforcing a set of rules far beyond what was intended or is even reasonable.
THAT is why I debate so strongly for the details, even when (or particularly when) I support the underlying issue. It's not enough to have a rule. You have to understand the real-world implications of that rule as well as how it can be misused.