if you dont hear from them before 1800 it's a self release at 1800

Meaning, I don't have to make a call or log into anything? Im just done at 1800?

Yes. Leave. Go home. Get out. Drink. Pop a cold one.

That's what I'm talking about...thanks guys!

You can also call for early release and they are supposed to let you go if all flying is covered. I called and finished a RAP1 @ 3 instead of 6 and got home early, 3 hours less is nice if you commute!

What kind of travel bennies does your family get at CPZ? AA and DL wise

Not good. Don't come for the bennies, come for the LA/SEA base, the lack of lifers and good movement. There are so many great things going on at this airline, but the travel benefits are not one of them.
AA you only get if you're LAX based, and I can't speak to those other than hearing they are not so good.
Everyone gets DL benefits. For the pilot, they're OK and obviously there is a JSA with everyone, but for your parents it's not great, you pay a yield fare/handling charge and parents travel as S4 with day of travel, even if you travel with them, essentially below buddy pass so careful planning needs to be used and avoid the heck out of ATL or they'll never get out. That said, I've still gotten Delta One for my parents going transatlantic, but it was off season.
We don't get any buddy passes to give out, nor can we fly confirmed for less, nor can you put a registered companion/friend on DL, just 'domestic partner/spouse' with proof. And for some reason OO parents don't pay anything for transatlantic, so I'm not sure why we have to pay $150. Something to look at when this comes up again, I'd say.

I see that our DL travel benefit info says we have priority S3 on Compass flights. Does this mean that we are the "same" priority as Delta employees on our own planes? (ie Compass employees and mainline employees are sorted by DOH.) Or do we get any priority on Compass jets?

You are correct that we'd be the same priority as DL mainline and then based off of DOH. You will always have priority for the JS on your own metal.