It's client-side only, so you can do whatever you want with it, even delete it or whatever. That is, no mission will ever 'depend' on it to load. It also includes a change to the size of M136/RPG-18 ammo (1 slot only) and makes FFAR rockets fire one at a time (rate of fire, AI behavior, and impact pattern are all unchanged).
I started playing with it after I asked... Something I've noticed:
Weapons that have, before the .pbo is added, been able to fire both SD and normal mags (like the BIS M4 SD or Lennard's L119A1) can now not fire unsuppressed mags. Not a big deal since the ballistics are fixed now. However...
RobertHammer's weapons (pretty much all of them except the MK17) can still fire both types of mags. However (again), shooting a SD mag at an AI elicits an immediate response and he knows right were you are. There must be something different with RH's config.
Don't mean to derail your video thread, I just haven't seen a O.N.E. "report" thread and figured I'd continue here. All in all, it's still a great addition, but just thought you might be interested in the info.