It would be interesting if Flutterflow provides an Action as well as CustomDialog and BottomSheet for the SnackBar, allowing you to provide a completely customized component.
Suggestions:
1. Provide resource to be able to provide a Custom Component for the Snack Bar.
2. In CustomDialog (already allows custom components) allow through a Boolean flag whether or not the overlay barrier should "lock" the rest of the ui (as it is today) being impossible to interact with other elements while the dialog is open.
3. Create a new Action for Toast allowing custom components that are specific to these notification messages within the app