Sounds like just something that comes naturally after you've been playing for awhile. It sounds promising at first because you're training yourself in your beginner years to think ahead and get your fingers ready.
However, there's other techniques that might suffer because of what you're doing because you don't have the experience to know what the fingering should really be like. You could end up speeding up your scales but end up lacking in the vibrato, bends and slides dept. which is where a lot of the feel comes from in lead playing.
Again..a lot of beginners fall into this trap of gaining speed and doing scales. Instead of always thinking about that, think about accuracy, clean playing, style, muting unplayed strings, using feel, originality and melody as well.