laguy442:
Right-click on Actions and choose Key Map Actions, New Do Mapped Key Action and choose the Assist keys. Here's an example from a Key Map I just set up for a new Commando team (for this team I use one Key Map for all of them, but wether you do that or not doesn't matter).



You also want to go into each Assist key and in the second step change the keystroke being sent to the keybind you use ingame for "Acquire Target's Target", if you haven't already.
Hope that helps!


OldRod_KS:
Sounds odd. With my Commando team that I just quickly set up I did the same thing, by placing Sticky Grenade for example as the first action (after the assist keys) and then Hammer Shot beneath, and Sticky Grenade is always the first ability to go off.