Drum Notation Key

I saw a discussion in an earlier thread about a standard drum notation key. I agree, that there is not a universal standard, but that being the case, I wonder if there is a feature (or if one could be added) to be able to add a drum notation key. This should be something that could be on a separate line and would include text under each note for what that note symbolizes. I would like to be able to edit the text and only add the notes that I am using for a particular piece. Any help or advice would be greatly appreciated!

-Jacob