Feature Request: Add ability to select custom drumsets when creating a new staff.

I suggest adding an option to load custom drumsets in the instrument selection dialogue box under Edit > Instruments. In addition, the Musescore could automatically search for .drm files in the Musescore folder and add them as options. Currently, one has to either use a predefined template or select a default instrument and load the drumset afterwards. For example, "Custom" could be one of the choices in the drop-down menu. This could also apply when changing instruments on a staff using "staff properties" or the "change instrument" text command.