Would be cool if you could trigger state triggers directly from Surface Identifiers. This way you could allow the player to move quicker or slower along designated textures (path = fast, sand = slow, etc).
For that specific scenario in version 3 you can use physic materials to increase or decrease the friction which would then affect the speed. But I do agree that allowing you to set a state name would be useful. Right now I am working on the integrations and add-ons for version 3 so are not adding any new features but this one will definitely be good to get in.