I just discovered an incredible feature of BTT the other day! If you assign multiple actions to the same keyboard shortcut you get a dropdown menu with all of the shortcuts listed with the ability to navigate and select the menu via the keyboard. You can also map these to a mouse button if your device supports button remapping. For example, whenever I press the function+up button on the side of my house it copies whatever I've highlighted; when I press funtion+down it brings up my shortcut menu. See video.
I have a few categories of these actions if anyone is interested!