Sure. Best to consult with a more experienced ambo first, but if its reasonable and you can justify it, why not. Reasonable is the key word there. I wouldn't do clamshell thoracotomy, it would be absurd. I don't know the first thing about how to do it. A needle cric on the other hand, out rurally, well that's a different issue. I know the theory behind it, the gear is there, hop on the radio for a more experienced ambo's advice on its appropriateness and maybe they walk me through it. I don't see to much of a problem with that.
I heard a story about a basic who kept putting in EJ lines in perfectly healthy patients, at first he was simply asked to stop, but kept doing it and without a good reason, despite being repeatedly told to stop, so he was shown the door. That's pretty much the way of things here.
I think the difference is that our scope of practice isn't dictated by law. The service decides what we can and can't do, not some legislative committee buried deep in the bowels of parliament.