Edit - I contacted Austin at Clay.io and he said that the way I'm managing it already is the only practical way of doing so.
Dear everyone, presently I have the same game on Caly.io and GameJolt and I'm using each site's plugin to enable leaderboard score posting. Is there a simple way of disabling the clay plugin for when my game is running on GameJolt? i'm not sure, but I imagine that GameJolt users would not be particularly impressed with a game if it first asks them to log in to their clay account (which I imagine many won't want to have).
What I have resorted to doing is just before exporting the game for GameJolt I delete the Clay.io plugin - the event sheet is set up so this won't break the game. After export I undo last action and the game is restored ready for further tweaking. Is this the only way or is there something more elegant I could be doing here?