That's like one of those "if a tree falls in a forest..." questions. It doesn't matter if it's true if its accepted as dogma and your staff are uncomfortable doing it because it's against their protocols. Sure, you can fight to change things, educate your staff, get in on the pharm/med safety committee, negotiate with nursing leadership... But is this THE fight you want to spend your energy on? The answer is a definite NO for me.
I can McGuyver an epi drip too. But I need dopamine when I don't have time to place a central line right now because a bunch of other things are happening in the ED. If I don't have time for a central line, I don't really have time to mix/hang/pump/check the epi drip either. I do have time to say "hang the dopa".