As the name states, Blizzard Make ALL demons that demo summons being controllable via Pet Control Panel.
Right now Wild Imps, Doomguard from the talent, Diabolist Demons is not controllable at all. It makes harder to redirect damage or get away from combat for Demo.
If the issue lies in the possibility to stack Imps for big implosion then just replace Implosion for Bilescourge bombers and tune it’s CD and Damage.