I build an estimator (plugin) and like to show that it is used instead of the common ones. If I return an unknown source in the estimate function of the PrintTimeEstimator-Class the button stay red without any remark. So that is fine at first that I know it us used. But is it possible to set a custom hover text and color ?
I think PrintTimeGenius does this, I don't know how, but it removes the red dot and maybe replaces it with a star, depending on the configuration. You may want to dig about there to see what it is doing?