Agree with all of that, Naughton is a good player and we're lucky to have a player of his ability sitting on the bench covering both full back positions. A shame he hasn't got to play RB for a period of time, was very good there for Norwich...
Think he offers very little at left-back, he is way too reluctant to use his left foot/ go on the outside. Also, he doesn't really ever seem willing to get forward and attack the byline on either side, he is quite a predictable player. He is fairly solid and has an eye for a pass but we could do better. No idea what Smith is like, have only seen him come on in a couple of first team games and maybe one game against Barnet in League 2 many moons ago.
Hopefully with Rose back next season Naughton won't have to play left-back. Wouldn't mind keeping him and sending Smith on loan, we have far bigger transfer priorities than a back-up right-back.