Yeah, I initially liked not having to pick up DEX, but with STR maxed and CON high and expensive already, I suddenly found myself preferring 3 more DEX over 1 more CON, just for the reflex save (and a little AC).
But putting those points in Charisma instead, while not necessary, certainly would make things a lot easier (less clicking before UMDing), especially during leveling.
Actually I'd probably go with:
Halfling:
Strength 16
Dexterity 14
Constitution 16
Intelligence 8
Wisdom 8
Charisma 14
or
Halforc:
Strength 20
Dexterity 12
Constitution 16
Intelligence 6
Wisdom 8
Charisma 12