Never mind! I think it is my fault not to explain it enough.

The main reason for me is that I like to have play_stutter as a right click play button by default in all skins.
This idea came up in https://github.com/mixxxdj/mixxx/pull/77 by @uklotzde. His mapping is very sensible to me. If we do not agree, no problem, but we should at least make it possible to configure it that way.

Minor reasons:

* we have at least on customer -> @uklotzde 
* And VDJ has it as well.
* We are able to support 3 Button decks