Changes coming to role preference on PBE; you can opt out of your least favorable position
Check out the full post by following the link above to the PBE board. Basically, Socrates is saying you select your Primary/secondary positions and you sometimes may be put in your 3rd and 4th choices, but you'll never have to play the 5th.
Rejoice, players that don't know what a Ward is, you don't have to autofill into Support for next season! (PBE changes are tentative. Manage expectations accordingly)