Lizard said:However, when the rules come into conflict with player expectations, that's where the problem lies. An immobilized character can't move, and CAN do anything else. This makes sense if, say, he's immobilized by a glue trap. But if he's being grappled/held, and does something which, intuitively, he shouldn't be able to do in that situation, you get arguments.
"OK, you've got the hobgoblin in your grip. He smashes you with his two-handed battleaxe. Take 12 points of damage."
"Wait, how does he swing it when I'm holding him?"
"Nothing in the rules says he can't."
(And here the argument starts. So, fine, I houserule that he can't. A week later, the grappling PC is himself grappled. He wants to attack the monster holding him. I say, "You can't." He says, "But I'm only using a tiny dagger! I should be able to!" So another house rule is made. And another, and another...and soon the "simple" rules become a complex hodge-podge of ad-hoc rulings. Or, you could just say, "Suck it down. The hobgoblin hits you. Who's next in the initiative?" but that has its own problems...)
Very true, and it's always a question--house-rule for verisimilitude, or gloss over the absurdity in the name of ease of play? There isn't one good answer; it depends on how sweeping the projected house-rule needs to be, how painful the absurdity under discussion is, how strongly the debating parties feel about it, and so forth.
(In this specific case, I'm cool with allowing the use of most big weapons while grappling. Have a look at medieval swordfighting manuals sometime, there are a lot of tricks for using a two-handed sword at close quarters. I could even see using a spear, as you smash the guy in the face with the haft or draw the edge of the spearhead across his throat. If you want to wield a pike while grappling, though, we might have problems.)