Most of the old skoolers will do a leg drag from time to time (I do if its flat). Back in the 550 days you basically had to in order to turn hard and fast. The modern standup doesn't really require it and work best with just a ass-drag (or tuck-n-lean). In my case I will leg drag left but ass-drag right.
The best option is to use the riders wake in front as an inside berm (braappp) - but keep out of the fluffy stuff. Saves the most energy.
BTW: rab2009, what do you ride?