Make a ''Current Slide Lock" button. So you can edit on the go without having to worry about it going live accidentally.
I have had a couple embarrassing experiences while trying to edit a slide, like if I happen to double click or something and it goes Live.
That "button" would lock the current slide in. So if you had the screen blacked, there would be no way for it to un-black unless you hit that button. You could also make sot that if you do try to air something when that "button" is on a notification would pop up telling you what the deal is . No more accidents. :)
Stuart Dundas commented
Another element to this would be when making hot edits while service is on air, (fixing a typo or reference) that it wouldn’t show us typing in the new words/lines until we finished the change.