They don't seem to track eligibility changes for pitchers. According to the rules:
Positional Eligibility for Pitchers
Additional positional eligibility for Pitchers occurs when one of the following conditions is met:
* Pitching appearances last season: 5 starts / 8 relief
* Pitching appearances during current season: 3 starts / 5 relief
On the Eligibility page both Carlos Zambrano and Alfredo Simon both show as SP with no relief appearances at all. They do show Kyle Lohse having appeared in a game as a LF though.
Does anyone know if SPs can gain eligibility as RPs, or the other way around?