Here are two more rules from last game.
Power of the Machine Spirit, 40k6 pg 40.
In a turn in which the vehicle neither moves Flat Out nor uses smoke launchers, the vehicle can fire one more weapon at its full Ballistic Skill than normally permitted.
Context: Opponents Land Raider Crusader moved 12" which normally weapons would snap fire. He wanted to shoot Multi-melta. Wasn't sure if it was snap fire or full BS. He reminded me PotMS shoots at full BS if vehicle moves 12".
Power Fist, 40k6 pg 60
Type: Melee, Specialist Weapon, Unwieldy
Specialist Weapon, 40k6 pg 42
A model fighting with this weapon does not receive +1 Attack for fighting with two weapons unless both weapons have the Specialist Weapon rule.
Context: Opponent had a Templar with Power fist.was going to roll 3 dice to attack because it also had a bolt pistol. Informed Power fist is a specialist weapon can don't gain extra dice because of extra close combat weapons.