What national guidelines? You truly don't know what you're talking about. RN's being allowed to or prohibited from pushing propofol is a function of STATE nursing practice acts, not a "national guideline".
There are anesthesia techs that just take care of washing blades and stocking carts. And then there are those who actually participate in some hands-on patient care in the OR, pre-op, etc. There are "anesthesia techs" that are RT's or paramedics, or other trained allied health providers. (You do know that lots of RT's start A-lines and paramedics intubate, right - or maybe you didn't) Also, depending on state medical practice acts, a physician MAY delegate ALMOST any task to a non-physician, ESPECIALLY if they are standing right next to them and providing hands-on supervision.
Facts are your friend - you clearly are short on them.