We frequently vector VFR traffic in class E airspace for practice ILS approaches, however they are informed that all headings and levels are advisory and that they are responsible for their own terrain clearance and should report if at any time they are unable to remain in VMC.
The element of a control service within class E airspace doesn't necesarily mean vectoring, for us it tends to be restricting the aircraft to not above a particular level, that way they can do what they want and I can safely drop IFR traffic on top safe in the knowledge that the known VFR traffic will be level separated (even though there is no requirement to do anything other than pass traffic information to the IFR and VFR on each other).