Yeah, I just did that today exclusively for soundsnap. Feel free to add categories to all my sounds - you know better what´s already there but maybe this one wouldn´t be so good just as a button sound cause it can be used in so many ways...
Thats amazing. There 's a whole world in there.
I would categorise it under 'Buttons> Startup', because it could be used for a device (for example a computer) starting up..
But its up to you!