Hrqls: I think the move you suggest is a huge blunder and would love to try a computer analysis at some point. Your opponent has a great chance of running or blocking your 7 point etc etc.
I'm sure with that particular roll you must hit the opponent on your 7 point. In fact even with 6-4 you should play 13/7 24/20 and with 6-5 I would hit both (13/7 6/1).
Interesting problem: If you roll 6-6 do you play 13/7*/1* or 13/7* 24/18 ?