As far as the Rockets go, I would have to go dig, but some of the earlier mods of the Mk66 and I believe the Mk40 rocket motors did have some issues with ejecting debris that could cause damage to aircraft. I know for a fact, (because I dealt with it in the OH-58D) that many of the older models of the AGM-114 (the C and I think F models) were known for the potential for ejecting debris that could and did cause damage to stabs and tail rotors. For this reason, we would mount FOD deflectors onto the back of the rails of the Hellfire Launchers.
As for the rockets being more accurate on the inboard rails? That is true. However, the reason we are not authorized to put those on the inboard rails now is due to the potential for engine flameout from ingesting the motor exhaust during ripple firing. So we only put them on the outboard rails. It's not a huge potential but it's there so they don't let us do it.
As for how I know? I fly them.
Oh and the gun tracks head movement. It's tracking the movement of the helmet through a bunch of sensors mounted in the cockpit, not the monocle or the eye. The monocle is strictly a display for imagery and symbology.