This is a good discussion. In my games where I set aside points for daemon summoning I also often find I'd rather keep my CSM characters moving during the movement phase.
However, in many of my games this year I've been taking Renegades and Heretics alongside my Chaos Marines. Aside from Russes, Sentinels, and Marauders the R&H underperform, but that's another thread.
But I've been rhinking about using the R&H Renegade Commanders as a base for some Turn 2 summoning. On Turn 1, run 1 up each flank. Enemy snipers always ignores them and shoot my CSM characters, Deffy, or my Zerkers' Rhino on Turn 1 anyway. Then on Turn 2 they start summoning! This would leave my CSM characters free to keep keep moving during their movement phase. It would also make Renegade Commanders Dnegrah and Vicious Pete (currently a useless tax) quite useful!