Most wicket-keeper catches in a season: Murray Oldroyd - 23 (Season 11)
Most stumpings in a season: Dion Tribe - 5 (Season 7)
Most fielder catches in a season: James Fiebig - 8 (Season 8)
Most run outs in a season: Stephen Byrne - 3 (Season 7)
Lol, 3 times, there have been 23 keeper catches for a player in a season, although I decided just to put in one.