Rollover Help is something I would like to be improved dramatically throughout Scaler! That’s the teacher coming out of me. I don’t think learning should be a guessing game.
You could have the option to turn it off or on. If there is a button to be pressed, an option to be made, or just a particular style possible, then there should be clear information to help the user understand and decide.
I would like to see this improved to incorporate not just tools. As a new feature, button, style, or loop is added, a Help File should be created and added to the PopUp Roll Over system. As you say, it is easy to miss, so maybe a window close to the item would be best.