I find that the use of a battlemat and markers in combat has solved most of these problems. It becomes pretty obvious what you can and can't do when you're restricted to a number of squares worth of movement.
I get more annoyed by players who know, but abuse rules of character creation and item crafting. I have one, and every time his character gains a level I have to go through the new character sheet with a fine-toothed comb, comparing it to the old one. He's been gone the past few months, and the game has been much more fun for me. Now he's returning, bringing his brother, a self-described "powergamer" (First character concept, after being told it's basically a core rules game: "I'd like to run a race from Savage Species."

). I've kicked back Powergamer's first two character sheets for inability to follow the house rules -- and am seriously considering withdrawing the invitation to play before he even plays his first game with us.