So I was interested in finding out how MFL handles position changes for players like Jadeveon Clowney (LB to DL) and more recently Ty Montgomery (WR to RB). Here's how MFL addresses this question:
Can Ty Montgomery be listed as a RB instead of a WR?
Answer: Yes, the commissioner can use the For Commissioners > Setup > Players and Rosters > Change Player Position screen to change the position for any player as needed or desired for your league. After a player position is changed, the player will only receive fantasy points based on the scoring rules defined for his new position.
For some background on the player positions, there isn't any way to designate a player at a "dual position", so each player is listed within MFL at a single position. We use the Rotoworld.com Depth Charts as our official source for all player positions at the beginning of the season. Then after the season starts, we generally don't make site-wide position changes, so it is up to your league commissioner to decide how to handle any player position changes after the season starts.
Regardless of how Rotoworld.com has a player position listed, the commissioner can use the above Change Player Position option to over-ride any player's position.
In addition, if you wish to allow your owners to be able to change the player's position, you can enable the option "Allow owners to change the position of these players back and forth between the MyFantasyLeague.com default position and your custom position" on the Change Player Position screen. Then after that is done, the owners will be able to use the For Owners Change My Player Position option to adjust the position of their player each week as needed.
Source:
http://www03.myfantasyleague.com/2016/support
So based off of that answer, it would be up to us on how we determine a position change. I have a few ideas that we could discuss for next season:
1. Allow owner to request change, but owner can only change that player's position once. Once changed the player remains at that position for the rest of the year.
2. Once more than 50% of games played (minimum 5 games) are played at the new position, we automatically change the player's position (or similar to first option - owner can request change)
3. Do nothing. Once player starts season at one position, he remains at that position for the remainder of the year.
Any other thoughts?