Limit number of duplicates toasts of the same class shown
Add optional settings in order to reduce the "notification toast" message spam, especially with the "Unable the rez object.."
When limited, display the latest message only.
To display the latest toast of the unable to rez object only, so you don't get the spam.
Maybe a option to just disable "unable to rez object" messages? Oh, or by the same class do you mean if there is already a "unable to rez object" toast up, not to display another?
I am sorry for the misinformation.
That has no relationship to Notification Centre or EV-46, but rather to LL's own toasts.