Unless it's for roleplaying, I'd drop the Mercantile and get something more useful. I find that Mercantile increases on its own fairly often anyway. I'd also switch Short Blade and Block. Weapon skills increase fast if you regularly engage in combat.
Well, here, its different now, i just made block less important and short blade higher up, and dropped merc a d asically did the basic theif character with minor changes, i can kill mudcrabs easyily though, thats a good start, Im enjoying morrowind, but one quest, in third person can you only view from behind?