I'm talking about a saurian-like carapaced creature. No changing parts (retractable, etc), and no bendy parts (because carapace). It needs to do almost anything well (but not great).
closed as unclear what you're asking by nitsua60, Monty Wild♦, bowlturner, HDE 226868♦, Hohmannfan Feb 3 '16 at 4:03
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Add another opposing thumb on the other side of the palm.
Allow the tips of each finger to secrete a variable strength adhesive which evaporates a short time after it loses contact with the reptile's body.
Add a sharp ridge along the back of the hand since that flat space doesn't do anything useful now. The ridge can act as sharpened brass knuckles in a fight, but would also save them the need to carry a pocket knife.
Bio-luminescence from either the palm or finger tips. From the palm its a flash light and from the fingertips, a work lamp or pen-light.
Have microscopic Hairs grow on your fingers and palms. Like some kind of insect, you could use these to walk up walls.