If you're only playing two, tank will probably end up being the better choice as you'll want to be able to micromange the tank more against an overzealous group of DPS. Especially if you want to avoid issues with slave running or getting stuck out of range.

Click to move is under Blizzard Mouse Options {ESC > Interface > Game {Not Addons} > Mouse}

Now go to Key Bindings {ESC > Key Bindings} and look for the Targeting Functions section. Near the bottom of that section, you will find Interact With Target. Set this on your as well.

Or do it in ISboxer. http://www.dual-boxing.com/showthrea...ght=click+move