My group read the RF rules and chose to discard them years ago instead we use a mechanic we`ve called "eye of the emperor"
Eye of the emperor represents those miraculous hits that inflict tremendous damage regardless of intention, skill or the odds against them. Such shots and strikes must surely guided by the divine power of none other than him on earth, the master of mankind.
On a roll of a ten for damage the player rolls the damage dice again and adds the result in the event another ten is rolled then they roll yet again. These rolls are not optional and must be made even in the event of friendly fire or accidental self-wounding.
Alice the acolyte hits Charlie the chaos champion square in his big smug face with her trusty hammer.
She rolls 10 for damage, the eye of the emperor is upon her!
Alice rolls her extra dice... another 10! truly does he emperor`s gaze lie on Alice tonight!
She rolls again, 6
A total of 26 damage! The shattered remanants of Charlie`s face don`t look so smug now.