Well, as long as only I and spleen played the cup, Xan can add this rule if he likes to (I and spleen played like that):-
"If an opponent accidentally plops, a player must skip the turn, so that an opponent can teleport back to safe platform behind he/she plopped."
Because if player kept going on, then opponent will get two turns disadvantage. Also, you can add "Not doing the skip and taking the two turns advantage will result in automatically lose to player".
Well, that gives an option for Xan too add the rule or not.