The multi-sided token is just for the appearance (graphic) of the token. For a player you could have one token where it has a separate side for different clothing, weapons, positions like sitting or laying, etc.
Once you create the token from the rollable table you assign it the values like linking it to a character sheet, setting up your bars, and their vision radius. You then you make it the default token for that character. Now when you drag that token onto the table it will be setup with all of their stats but allow them to right click and change the graphic. The stats (like vision) is tied to the token as a whole, not the different graphic sides.
For what you're looking to do I would recommend the TokenMod API script. It allows you to make changes to a token by way of a macro. So you could have a blindness macro that changes the distance a token sees. You click on the token, click that macro, and it can change the value for their sight.
And fortunately for you, the master of all things API is already involved in this thread and can probably provide much better instruction than I can on this topic.