If you can replicate this in a sample capx it would be good. Not everyone has time to try and recreate the problem in a capx.
edit: try this method. I've put in a button to toggle the 'in use' for each Customization. It retains the 'trigger once' and will work for any number of Customizations.
[attachment=1:3iv6dfve][/attachment:3iv6dfve]
If you want a simple checkbox it can be as simple as this
[attachment=0:3iv6dfve][/attachment:3iv6dfve]