One of the options in Scripts is to Create a Message Window. This will pop up a KACE alert window with your text and an OK button and will stay on screen until OK is pressed, or the timeout is reached. However, the script will proceed regardless of the state of the Message Window. Please add the ability to choose from
OK
OK/Snooze
OK/Snooze/Cancel
as user options for a Message Window, and have the script wait for user input on the Message Window before continuing. This would give Scripting's Message Windows the same features as alerts in Managed Installs and Patching.