Pitchers should be either SP or RP, not both. For example, Danny Duffy was the Opening Day starter for Kansas City. Why would he be an RP?
Just pick the likely position they're going to be used at the start of the season. If they get moved into bullpen, like Danny Salazar of the Indians was reported to be, well, then so be it.
People with Salazar don't get the option of using him as an RP now, whereas some pitchers that currently allow that option never actually pitch in that capacity.
David Hewitt commented
Huzzah is right. For Fantasy purposes attaching an RP to a Starting Pitcher is not necessary for the majority of the SPs. The Player Info box (red, yellow, gray), when clicked, it only shows 2-3 starts for a SP/RP. The Player Info page for an SP, it shows last 8-10 starts on the 1st page. The pitchers with RP attached has this flaw. An SP does not need RP attached to him, unless he does work as a Relief Pitcher. Leave it off for the Fantasy Baseball Managers!!!!