I doubt this would happen because the author's mind would be blown but I want them to write stuff about the Emperor going into battle with his Custodes and Primarchs.
Maybe even the Unification Wars?
It seems like there is a lot of talk about what goes on in the warp but we never really see it hands on. I wish they would write books that were specifically about daemons in the warp and stuff like that (fluff like that)
+MAY THE DARK GODS BLESS YOU WITH MANY TENTACLES+