1) Limits like what? Unless I'm misunderstanding your question, there aren't any.

Just like in real baseball, there are no limits to how often a manager can use a particular RP, or his relief "staff" in total.

2) No. The stat category that gets you one point (and will enable us to track the 162 game maximum for SPs) is "Games Started".

There's a separate option in pitching stats for "Appearances" which we are not using.