text: Rules: Roster Settings (Custom) - ESPN
  ESPN » Free Fantasy Football » Rules: Roster Settings (Custom)
  In standard leagues, teams draft players from the whole NFL universe. However, custom leagues can choose to draft from both NFC and AFC player pools, or the league manager can choose to create an AFC or NFC players-only game.
  Standard league rosters have slots for a total of sixteen (16) players per team. There are nine (9) starting slots. In custom leagues, the LM can adjust the roster size to best meet the league's needs. See Custom Roster Settings (below) for more information.
  . The Roster Settings page in League Setup allows the league manager to customize:
  For example, if you're in an 18 team league and select two (2) Starting positions at the Quarterback slot, there will not be enough actual starting NFL Quarterbacks for each team in your league (18 x 2 = 36, and there's only 32 teams in the NFL).
  Likewise, if the league has a high number of teams in it and the league manager sets a slot maximum to a large number, some teams in the league could hoard all the players from that position so there's none available in free agency. In short, select your roster settings wisely! These are controlled via the pull down menus in the 'STARTERS' and 'MAX ON ROSTER' columns.
  NOTE: The maximum allowed roster size is any combination of 40 slots.
  Listed below are all the available roster slot choices for Custom leagues. Creative league managers may find they are able to create unique and unusual league types via their roster position selections.
  NOTE: If you're league is set for each team to have a Team QB, you will be able to place the Team QB only in the Team QB position. So, if your league offers an Offensive Player Utility slot, you cannot place a Team QB in the Offensive Player Utility roster spot. However, if your league is set for individual QB players, you would be able to place your starting QB (Tom Brady for example) in the QB roster slot AND you could place your backup QB (Jamarcus Russell) in the Offensive Player Utility slot.
  All leagues are retained from year-to-year, regardless of keeper setting. However, you are given the option of setting keeper rules for the upcoming season and the following year. If you decide you want to use keepers this season, you can do so by opening the LM Tools page and then selecting "Yes" from the drop-down menu. You will be given options for how many keeper slots to make available and when the keeper list locks. The same applies for the next season.
  NOTE: If you are continuing a league from a different provider, you will need to select Keepers for use THIS season. You will then need to go into the Edit Team Rosters link and manually assign the keepers to their appropriate teams BEFORE the draft.