@StrayFeral adding extra build menu entries is possible but is not dynamic, look at the Geany wiki, there is a small thesis on configuring the build menu, it even explains the file format so after studying that you are qualified to edit it if you _really_ need to ;-).
Note that due to limitations of the implementation of the keybinding prefs as a fixed menu it is not possible to bind shortcuts to additional build items, but you can use accelerators.