Greetings!
There's nothing (to my knowledge, anyway) that says you can't run a Gladius Strike Force as a Detachment, and also run along side of it as part of the same list, a second stand alone Combined Arms Detachment (
CAD) consisting of say, a Chaplain or Librarian (with or without a Jump Pack, your choice) along with a pair of five man scout squads, for your mandatory two troops choices, as well as an Assault Squad in one of the three Fast Attack slots in the
CAD. That would allow you to run two Assault Squads (One in the Gladius, and one as part of the
CAD), a couple of Scout Squads (which is fluffy for the Raven Guard if my memory serves), and a second
HQ choice. I'd suggest a Librarian, unless you're planning on running a Librarian as part of your Gladius as the
HQ choice.
You'll be paying a 'tax' of points for the pair of Scout Squads and the
HQ choice as well, but you won't be missing out on any free transports this way for one and the scouts will have Objective Secured since it's a
CAD.
That's how I would work it, were I you.
Gladius with whatever you choose to field in it, with an attached
CAD list consisting of at least the
HQ, two small (5 man) scout teams, and an Assault Squad.
I hope that helps. Take it easy for now.
-Red__Thirst-