I am currently GMing a Pathfinder game and the following situation came up: One of my players wanted to have his two-handed weapon held in his off-hand, while having a throwing weapon readied in his main hand. I told him that he was not allowed to do this because he cannot wield a two-handed weapon in one hand, but he technically is not wielding it. This brought up several scenarios which I will go over.
Before I begin, I hold the following to be true: Switching how your hands are used to hold weapons is considered Not an Action, unless doing so would require you to drop a weapon (a free action) or draw a weapon (move action).
The first scenario is moving with the two-handed weapon in the off-hand and a throwing weapon in the main-hand. I house ruled that he must take a non-stacking Medium encumbrance penalty while he is not gripping his two hander with both hands, as the weapon is cumbersome. He countered that a high strength character should be able to hold it without penalty, but I countered that it is the size of the creature holding the weapon and the weapons encumbrance (not its weight) in relation to the ability of the creature to manage it that determines this. A two handed weapon is just too awkward for a medium creature to hold without two hands. My understanding of the rules is that he should not be allowed to move at all unless the weapon is held in two hands or strapped on in some way, but I was giving him the benefit of the doubt. First question: Are there any RAW that specify whether or not moving is possible with a two-handed weapon held in one hand?
The second scenario is the same hand setups as the first, only he is throwing his weapon with his main hand while holding a two-handed weapon in one hand. I told him that he should take two-weapon fighting penalties for his ranged attack. Second question: Are there any RAW that specify whether or not you are allowed to make a ranged attack with a throwing weapon with a two handed weapon held in the off hand? Is it even possible to do that?
Lastly, the Quick Draw feat seems to allow you to switch weapons as a free action, which would reduce the need to try to do something like hold a two hander in one hand to squeeze an extra attack out, or have to options to attack with. It is the same mechanically (not thematically) as the above scenario, but fits into the rules.