OMGZ Brushless Revo!!! :O Need some advice :D

Another question I forgot to ask.

I've read that alot of people lock out the 1st gear in the Revo when converted. What is the reason for doing that? Obviously you don't really need it when you have an electric motor, but wouldn't it help to keep it in terms of lesser battery usage and longer run times?

I'm guessing its going to have something to do with keeping the external brakes and stuff, but I will wait for someone who knows more than me to help me out hehe :D