Rules patch: Steadfast v8.1 (so many things that can be changed...)

Oh, this one has been aggravating me personally, ehehe, and it's surprising how much people disagree with how GW made the rule in this edition, but nobody seems to be willing to address it in a practical manner. At least as a gentleman's agreement in casual games.

PROBLEM: charging a ranked unit on its flank or rear with another unit (with at least 2 or more ranks of five or more models) disrupts the first unit's ranks. This negates that unit's rank bonus (GOOD!) but does not negate steadfast (REALLY!?).
SOLUTION: disruption negates steadfast. (I can't make this any simpler.) EDIT(6/06/15) A unit cannot be steadfast against any model that can Thunderstomp them.
This rebalances the steadfast mechanic, especially considering the significance of flank charges in a combat. Furthermore, it grants more stability to Monsters, which can struggle severely against large blocks of infantry, and have the odds stacked against them in terms of breaking the opponent.

PROBLEM: undead units gain no benefit from being steadfast, which is a huge benefit to most other races in Warhammer, and often the reason why many terrain pieces (such as buildings) are beneficially exploited by generals.
SOLUTION: undead units that are steadfast suffer 2 less wounds due to Unstable. This stacks with any other effects that modify the Unstable rule (such as a -1 to Unstable wounds granted by a BSB).
Despite the fact that undead are mindless, and the strength of their numbers should not impact their capacity to fight effectively, the combat pressure a large body of corpses provides should be taken into account. Generally, this will mostly come into play with units such as skeletons and zombies, which are easily destroyed anyway, so it simply mitigates how crippling this mechanic is to such units.

Hopefully, neither of these two changes are too powerful, but make the game more logical and coherent, and ensure that some races don't get the short end of the stick when it comes to certain situations, SIMPLY due to a game mechanic particularity (such as undead gaining no benefit from steadfast from being inside buildings).