Editing/Adding Instruments

I'm not much of a programmer, but I think it would be beneficial to be able to manually add instrument sounds to the SoundFont for different sounds.

An example would be in my attached score - on the second page bottom left-hand corner measure, the vocal part switches to kazoo. I added a staff text and went to change the channel for the measure (like you would do for pizzicato on a string instrument) but there was no kazoo sound.

The kazoo instrument placed in MuseScore does not even play a kazoo SoundFont.

Is there a way to add this, or can it be appended in the future?