I'd like to see some way to pin grappled, prone targets.
I'd also like to see some rule of thumb for giving monsters proficiency (or whatever) with grappling when they shouldn't be mopes when it comes to grappling. E.g., I doubt your average orc is a stranger to grappling. I don't even want to do the math for how many orcs it takes to hold down a fighter with Athletics proficiency and a level of thief for Expertise.
I'd also like to see some rule of thumb for giving monsters proficiency (or whatever) with grappling when they shouldn't be mopes when it comes to grappling. E.g., I doubt your average orc is a stranger to grappling. I don't even want to do the math for how many orcs it takes to hold down a fighter with Athletics proficiency and a level of thief for Expertise.