ASA SP courtesy runners?

[archangel]

Doing a SP ASA Co-ed game when the defensive team (after that 1/2 inning) tells me that the other team had put in a courtesy runner for their catcher. As I was working alone, didnt notice, no one asked or said anything at the time, so I asked that team about it. They said new ASA rule allows a CR for catchers and pitchers, but I ruled that it wouldnt be allowed anymore.
I understand the reasoning in fast pitch or baseball- catcher putting gear on(time saver), or saving a pitchers arm (stay warm ect) but SP?--figured that team was trying to pull a fast one and said No way!
Another ump said later, he heard it may be true. Comments?

[umpharp]

Must be that brand new rulebook that we haven't seen yet.
Good call in not letting them use it after you caught it. Unless you have a local rule used by your league, there is no CR in ASA coed play.