...and that's all I'm trying to say
I'll make a confession... I don't use Diagonal Movement properly!
I felt as though the 1-2-1-2 rule for diagonal movement added nothing to the combat, so I dropped it.
Someone else may drop something like cover for being around the corner of a doorway. And that's fine! Someone else might drop AoO all together! And someone else might play Basic D&D (I've been tempted sometimes myself).
But the important thing is, yes, the DM should run the game. Now, do I make exceptions if a player wants something? To a certain extent, sure. But I have disallowed things as well, such as half-dragons. I don't like them.
It will be hard if the players are used to getting everything their way. But, I bet, if you approached them and said, "Hey, I need to get the game under more control so it doesn't take me so long to prepare, and it's not as much of a pain to run. Here's what I think we should do." If any of the players refuse to let you run your game the way you see fit, you need to ask yourself why you are playing with them.
Gaming is a relationship, just like any other. Give and take. But in this instance the DM HAS to have more votes than the players when it comes to mechanics. Seriously.
I hope you can find a way for you and your players to be happy, no matter what system you finally use.
Sebastian Francis said:
[Stares in mirror]
"It's my campaign...it's my campaign...it's my campaign..."