In the times of second edition most rolls have been made with 2D6 and there were special block dices. Now the only important in-game roll which needs a 2D6 is armour. If armour were a stat from 2 to 5, it would be in line with ST and AG related rolls.
Translated this would mean:
AV 10, AV 9 changes to AV 5
AV 8 changes to AV 4
AV 7 changes to AV 3
AV 6 changes to AV 2
The rules of 1 and 6 would still apply, no matter what modifications are made to the dice roll.
Injury rolls would be standardized too:
1-3: Stun
4-5: Knocked out
6: Casuality
Necessary skill changes:
Claw: armour-RR
RSC: injury-RR
Mighy Blow: +1 to armour roll
Vicious Blow: +1 to injury roll (new strength skill)
Piling On: If an opponent is knocked down, he is automatically stunned if his armour roll succeeds.
Dirty Player: +1/+1 rather than +2/+2, perhaps disallow assists for fouls, or, since assists are much more powerful this way, DP only gives +1 to injury-rolls.
If a player rolls for skills, a 9 allows him to upgrade his armour instead of taking a skill.
Toughness (new general trait or skill): -1 to injury rolls, rule of 1 and 6 still applies.
This would have serious percussions towards the balance of several teams though, the new AV 3 is significantly worse than the former AV 7, and the probability of Knock-outs would increase too.
The benefit would be a simplification of the tables and it would make armour similar to strength and agility.
Please don't be too harsh, this isn't meant that seriously.
