Oh yeah, if you're VFR, looking to pick up an IFR clearance for approaches, let the controller know. Had a guy one time call up and ask for a LOC into the local uncontrolled airport. He simply requested a "practice approach." After getting radar ID, I gave him the usual "maintain VFR, practice approach approved, no separation services provided." Which he came back with an attitude "well...doesn't that kinda defeat the purpose?" After a couple more exchanges, I finally got it out of him that he wanted an IFR clearance. He could have eliminated all confusion to begin with by just saying "N12345, requesting local IFR to XYZ for a practice localizer approach."