Captain Harlock said:
HO HO Malal! My My The renegade anti-chaos Chaos God! Kaleb Daarke and all his friends. Truly you are wise in the ways of ancient lore. Most GW younglings are not even aware of his existence. Now all we need to do is reintroduce the Gods Of law: Solkan Alluminas and let Arianka out from her Crystal coffin prom beneath...was it Praag? My memory fails me.. and then its a party. Sensei Knight in 40K anybody? Theres gotta be a few hanging around...
I reintroduced Malal to a bunch of players during the Storm of Chaos summer campaign. I played a Beastmen army with the 'Mark of Malal' also known as the 'Mark of Opposition.' Basically, the characters and units took the opposite mark of whatever god they were opposing at the time. In game terms, I had 4 army lists, one for a beastman army of each Chaos God and played the appropriate one.
And let's not forget the Sons of Malice Chaos Marines in 40k. They may not say specifically that they are marines of Malal, but they wear the black & white armour and bear his skull emblem on their shoulder pads!
As for WFRP, I always use the older stuff mixed in with the newer stuff. Same with DH and RT, which I use my old WH40k Rogue Trader book and the Realms of Chaos books as background for. I may like the newer games, but it is the art and atmosphere of the older books that always have and always will inform my vision of the Warhammer Universe...
My hat's off to you, Xisor, you put things better than I could have.