After seeing what Blood DK did to WoW, I am wholly against stacking absorb shields as a means of tanking.

Perhaps a stacking buff which gives a 'chance on taking physical damage' to mitigate it as though it was blocked with a shield.

Also, as for taking your stun off cooldown and making it the same as Shield Bash... im cool with that. In fact, completely swap them. let Paladin have the stun thats on CD so that we can start actually tanking things instead of being relegated to auto-attack-only+shield bash-only duty.

Be careful what you wish for sometimes.