You know it never occurred to me to use the inside of my left foot to line up. I think I may try that tomorrow in league. If anything, it will take less time to line up.
For 10 years I would line up with the tip and center part of my left toe to line up. Personally though, if someone was to ask what board I was standing on I would go by the center of my foot opposed to using the inside of the foot.
However, I feel the need to get too perfect and takes too long to line up exactly so I will try the inside of the foot.