I concur. Someone mentioned incorrectly allowing the aircraft to intercept the localiser when ATC might want you to go through and turn back - shouldn't happen because the instructions ATC give should make it completely obvious if you are cleared to intercept the ILS, or not. If not, you don't!
So, I arm the auto ILS when on a closing/intercept heading once through the 90 degree "base leg" heading. I just let it get on with it but closely monitor what it's doing as if it's a naughty co-pilot. Although the dastardly device flies the approach much better than I can, anyway.