Preventing unintentional re-rolling/double-rolling of Initiative?

Without going into too much detail, I have a player who sometimes unintentionally double clicks buttons and so far the only time that has been an issue in-game has been with initiative rolls. The turn tracker allows multiple initiative rolls and "saves" the last roll. I can obviously have someone else roll for him but would rather solve this programmatically if possible. I am thinking that there are multiple solutions to this problem. 1) Look for a way to disable the initiative macro button for a given time period after single-click. 2) Alter turn tracker's behavior so that it only accepts the first value rolled...Any suggestions?

A script could be written that would observer the turn tracker and revert subsequent rolls if made within some time limit.  That would be the simplest method for the API.

Here's a macro which may help: /emas @{target|t1|character_name} attempts to enter a quantum superposition, fails, and takes [[4d2]] Probability damage, angering the Universe. @{target|t1|character_name} shakes their head(s) and vows not to do this again! More seriously, you could give them an Initiative macro with a Query in it. A double click will throw up two Query windows... they'd have to really be doing it "accidentally" to double click the macro AND double-click or double-enter the Query pop-up. "Have you already rolled Initiative?" would be a potential prompt :)