Would make the tee shot way too easy...
As for playing down 5, my last play I was in the bunker in the left rough, and the caddie advised me to play down 5 with my second shot - I could hit it about 180 down 5 or about 80 yards out and across 2. It left me with a blind uphill shot of around 170 yards in to the green.
Being down on 5 strikes me as an option, but certainly not a great one.