I have to say I'm still a bit scared of pressing Run Once even though I know it still has another step to schedule. But I know plenty of new users who are also VERY scared of running a batch email and messing it up.
Yup and it's also hard for some of my team mates to see where the run once icon is. They're used to clicking on a "Schedule" button from the old email tool we used to use.
I am specifically referring to the button next to Schedule Recurrence. And yes, this would be confusing between the Qualification Rules and the actual "start this" action.