Categories: Keyboard shortcut to add category to transaction

Thanks for the idea Cristy of been able to select a category using keyboard shortcuts.  As a workaround, when you are on a sale or purchase window, if you tab down to the category field before selecting a customer or supplier, you can use the down arrow to bring up the category list.  Unfortunately though there isn't an easy way to select the category box once you have selected a customer without using the mouse.  The best solution will probably be to add a hotkey selection, for example Alt + C to bring up your categories list.  We would love to hear what others think about this.