If you have a dedicated lift for the park, then you can control. Vars Park has a dedicated one but doesn't filter since you have several lines adapted to your level, expert line is.. expert.
But where I was in Flaine, you have one lift for park + piste and kids are like "hey dad can we go in the park"--> shit happens. It becomes a highway in no time.
But yes, having a lift dedicated to the park is a potential solution.
I remember having several fights with parents when I would see how they slice the lips. When I see that, I kinda become a sensible danger in the park towards the kids and often the parents come to me to argue.
"Be careful, can't you see there are kids in the way"
I'm like
"hey, this zone isn't for you kids to slice what we shape every evening, this is called a snowpark and it has dangerous features, now when you bring you kids in the park and accident happens because one of us bumped into your kid, perhaps you should reconsider who is the danger".
Parents tend to be "im-the-one-who-knows-I-skied-20-years-before-you-were-born" so you can't explain them without getting into an arguement.