So we mod the grapple rules to allow it. HUGE FUCKING CHANGE OHNOES
Actually, yes. Grappling with a fellow medium sized creature shouldn't allow me to swing a greatsword while doing so.
Right, because it's so easy to attack the gnome at the black dragon's feet when you're trying to stab it's fucking neck from eye level as the dragon rears up.
Not really easy for him to attack me either. I'm not "distracted" anymore than if I was facing more than one foe at a time to begin with (which D&D doesn't consider a distraction unless you're flanked).
Have you ever ridden a horse bareback? (No, that's not a joke... ) Imagine if it didn't want you there. So easy to stab him while you do that, right? In the real world most humans get tossed after about 6 seconds when they meet an appropriately-cr'd rodeo encounter. No joke there either.
I'd probably be able to stab him even if he shook me off. Now, if you want to argue that I have a -4 to attack while he's tossing me, that I'd agree with. Even if I do get a grip.
Obviously you're impervious to such things as a pixie punching your fucking eye out or clawing its damn way into your jugular as you try to rip it off you. Oh wait, no, you just get a fucking size mod to the grapple check to prevent it.
That I'm not impervious to. But "I try and crush his throat with my arms" by the pixie...not unless its arms are longer than normal. Much longer.
Other things are possible. Encircling my throat is not one of them.
And the ways it isn't are mostly things that should exist in grapple anyway.
Should exist anyway? Yes. Should exist in this particular special attack? Not necessarily.
Robby: Yeah. Though if you use a light, edged weapon to help climb, asssuming you penetrate DR, you're doing damage just by climbing.
I'm not sure if that's a good thing or a bad thing, but it is a factor.
We do not need to lump "climb on and attack opponent" with grappling just to make it an option anymore than we need to combine tripping with regular attacks to make it an option, it must be noted, too.
Improved Grapple (or any other "You get a bonus to all Grapple Checks") applying to climbing dragons and wrestling bears and wrestling fellow humans seems off.