Don't really like the STGs on OKW Offensive Package. Don't see the point or synergy with the whole doctrine. Then again, MP40s weren't that hot either. My suggestion:
The doctrine is already very powerful with Panzerfusiliers and the Tiger, and Tactical Movement and Stuka Smoke Drop on top of that. The point of the Obers IR STG44 slot is to provide an ability that is rather low key (but still very good) so the power level of the commander is kept in check.
Besides, in team games T4 will almost always get built way before getting enough CPs for the Tiger call-in (unless player goes for double Stuka strat) so this ability could see a lot of use there. It makes the commander very versatile (as in it gives the player a lot of different build options).
I would rather they get standard stgs since the IR ones ignore cover and the less of that the better imo.
They only partially ignore cover. Obers IR STG44 only get a 0.9 accuracy modifier versus cover (0.5 for normal units). Their damage modifier against heavy cover is still 0.5 (same as normal units). So ultimately they do better against units in cover but they are nowhere near snipers or JLI in terms of ignoring the cover mechanics of the game.