Valve Cover Gasket Sealant... Where does it go?

Correct.
Plus a dab where there is a seam between case halves or covers.

I have never need it but I see where Kul is talking about. Back in auto shop class (highschool) in the late nineteen hundreds our teacher talked about sealant that I always held on to. He said that if you are to add any sealant to any gasket it should be applied very thinly to that whole surface. His reasoning is that there will be a seam between where the sealant stops and the actual gasket starts sealing and can create a leak over time. Applying it with purpose in one spot while leaving a thin bit over the rest of the allows the sealant to smoosh into where it needs with no seams. I probably am over explaining/thinking this and Im not sure if that's true but for some reason I have held onto that info.

i never had an issue with pulling the covers and putting them back on with a bit of oil around the rubber.

My biggest fear with sealing the engine case was bleed over on the internal side. I don't think I had any problems with the job(s) I did but the OCD in me had to be sure every surface had enough sealant. The bleed over on the open side wasn't too bad but I always hated thinking about what squeezed into the case. I would be more worried with the valve section.