The JF normal Arrow (they also have a turbo charged one) is variable pitch and retractable gear.
Note that Just Flight do have a Tomahawk in the works, but the Warrior II is probably still a better bet for emulating an Archer.
You can play with the flight models and tweak the performance in the config but ONLY IF you bought the aircraft outside the marketplace (from Orbx, direct from just Flight etc). Marketplace aircraft config files are encrypted. That may change with the upcoming patch.