61. is there a melee basic attack option that uses dexterity for attacks and damage?
The melee training feat used to work that way (or other stats), it was later changed with errata so it only applies to the attack bonus, and uses half the mod for damage bonus. Scout rangers and Thief rogues (both from essentials) both have class features that do that - which was probably the motivation for the errata to the feat. There might be other newer classes as well that I'm forgetting about.
62. does the movement associated with deft strike provoke opportunity attacks
Yes, if it didn't it would say shift, or move without provoking opportunity attacks. In general rules do exactly what it says and normal rules apply if not referenced.
63. is the shift associated with nimble strike any different than a typical shift?
No, other than it being part of the standard action of the attack, so you still have your move action to use for any other purpose.
64. concealment only applies to targets of melee or ranged attacks. what attacks does it not apply to?