Allow user to view screenshot, but not join session

I can allow users to view the screenshot using 

ViewSessionGuestScreenshot

But I can only allow them to Update Guest Info if they have 

JoinSession

I don't want users to be able to join the session, just to be able to view the screenshots and update them as needed.

I noticed that multiple other permissions also seem to be bundled in with it (like chat) - but Commands/Toolbox have their own permission set.

TL;DR I'm hoping for more refined security permissions where they aren't bundled a bunch of permissions into one.