Ok as discovered in my support request, this option by default will keep all existing silent installers even when deleted in the silent installers page.

My request is the default is dynamic, its off when nothing is set in the silent installs page, but on when at least one addon is set in the silent installs page.

If this isnt possible maybe a first time popup to warn new users how the default works.

I've made it so that if you import anything and make any changes (move or delete items) then it will check the option automatically.