Actually in most cases tooltips should AUTOMATICALLY state the shortcut associated with it. If it does not, then you may want to look into why that is so. In particular, any tooltip for a "verb" automatically has the shortcut appended to it, and that should include all tools. One of the advantages is that it automatically follows the actual currently defined shortcuts, even if they differ from the defaults.
- Adding the shortcut to the tooltip (see, for example, 'select and transform' tooltip)
good. I will do it!