Unfortunately no. A way to add or change a players position without editing has been on my personal wish list for a really long time. I just edit and police myself. For example, I'm converting a guy from LF to 1B (he had no secondary position). This year I edited in 1B as a secondary position. If, at the end of the season, he spent half or more of his time playing first base, he can become a first baseman (if I so choose). I also only allow these edits during a certain part of the off season and for the first two days of spring training. I have a part of my off season that I dedicate to a sort of year exit review/year entry goalsetting. This is when I can add or change positions.
It may not be cheating though, in my experience it doesn't always take. I tried to convert a CF to a third baseman once because I thought his stats were better suited to the position. He played three games at third, and was aweful all three times. I converted him back and he continues to be a respectable defender in the OF.
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