It might be funny and intuitive to put a text button on the toolbar and when it's clicked display a large hint on-screen saying something like: "You can add te

It might be funny and intuitive to put a text button on the toolbar and when it's clicked display a large hint on-screen saying something like: "You can add text anywhere just by clicking and start to type. So no need for this pesky button!" And then fade the text button away or even better destroy it with an explosion animation and then keep track of it in the session/user login.