Similar situations in my experience. My understanding is that you're only able to function to the EMT-P level if so authorized by the OMD. If you're on a BLS rig, you're restricted to BLS only. If you're off duty, you're restricted to BLS only. If you're working a designated medic position, you're required to act at that level, and nothing less. If you have a medication error, or a pt care error, the OMD can restict you to BLS pending investigation/remediation. This temporary restriction may not apply to any other agency that you happen to be working for at the same time, unless the restriction is placed by the state.
Bottom line, if your agency is using you to fill a medic slot, you're a medic 100%. If you're not assigned to a medic slot, being authorized to operate ALS is up to the OMD. Otherwise, if you're assigned to a BLS spot, you're restricted to BLS only.
Here at FCFRD, medics can operate as medics at any time while on duty, provided the necessary equipment is on hand (it always is). If you're dual hatting, you're still as responsible for pt care as any other medic onscene.
A Capt at 20 y/o? It takes at least 7 years here to get to that level (suppression, EMS, or all hazards), if you're lucky. Years of experience are needed before earning the priveledge of commanding your own company. I hope that you're on your game, lest you get your crew killed due to inexperience.
How exactly does your promotional system work?