Here are the last rules from game four of Dark Star and a question Bryan asked me that Sat night.
Walkers: Walkers and Assault 40k6 pg 84
Against an Immobilized Walker, models always roll for armour penetration against its rear armour.
Context: Psyflemen was Immobilized and assaulted by Skyclaw Jump Infantry. Was curious if it could rotate to fight them in assault. It could not. Was pretty sure of this but since I don't use Walkers a lot wanted to double check.
Denial Units 40k6 pg 123
In the Eternal War missions, all units (including troops) are denial units, save for a few exceptions. given below:
Context: After the game was talking to Travis about Scoring and Denial units. I was under the mistaken impression that only troops were denial units. He pointed this out to me. Thanks, Travis.
Controlling Units 40k6 pg 123
A unit can only control one objective at a time. If a unit moves into a position where it could control two objectives, you must make it clear to your opponent which objective the unit is controlling.
Context: Bryan asked about this Sat night. Didn't say exactly why. Just being curious about it. At FOYCON in Nov there was a CSM player that had a 30 strong Cultist squad that wanted to control two objectives. Informed him he had to choose one.