I've been waiting for someone more knowledgeable to answer you but no one else has so here is my reply: Yes, a tiny amount of silicon grease. I apply silicon grease to seals and gaskets using one of those pots with an impregnated sponge inside. It applies just a small surface coating.
Here's the caveat: I've only replaced pusher seals once. But it seemed to work fine.
I've replaced case back gaskets a lot more often, though.