I'm pretty much going to quote Dwayne here and reiterate what I've already said a hundred times about the need for EMS to mandate at the VERY minimum an Associate's degree and ideally at least a Bachelor's; or at least have it a viable option nationally instead of only at a couple handful of universities throughout the country.
I would however like to add a couple of things. First of all, if it's a deficit in education that is making medical directors hesitant to put us in those roles of providing preventative medicine, then I would suggest that they take a proactive approach within their own services (along with all physicians who deal with EMS as well) by implementing advanced educational programs, classes, what-have-you that WILL give us the knowledge and the skill to deliver this facet of care which, in all honesty, would arguably make a bigger impact on patient survival (and more importantly, quality years of life), and on decreasing recurrent hospital admission.
I don't claim to know what's best for everyone, and when in doubt, I will always advise my patients to go to the hospital by EMS, but at the same time I am a tremendous advocate of not transporting folks who don't need to go by EMS, and in counseling and educating patients. I like to give my patients as much information as possible as to what we are finding in our assessments, what we think is going on (or if we have no clue), and what they can expect at the hospital; and for those patients who don't need EMS, I first of all always tell them that we're more than happy to take them if they want us to bring them in (because we cannot currently refuse transport), but I also make sure that they know what they can expect from us (i.e. a taxi ride if that's all their condition merits), and what I think the hospital will probably do for them. I also like to let them know what other alternative options there are (i.e. going POV if that's what they want, "staying and playing" and calling us back if something changes and otherwise following up with their family doc, etc).
One thing I've noticed is that we in the medical profession do an absolutely TERRIBLE job at telling our patients what is going on, and I think that a lot of the time we can ameliorate much of our patient's concerns simply by bringing our knowledge of medicine to their aid when it comes to their medications. I may not know the medication, but I can probably understand the medical jargon on the label or in their discharge instructions and if nothing else I can try to explain it to the patient in a way they can understand if they have concerns about it. In that sense, I think that we are capable of counseling patients about their medications to a certain degree, and I've done it before with a patient who was just having an anxiety attack because she read all of the side effects her medication can cause and it got her worried that she was going to suffer any or all of those side effects.