So... when I help someone out and need to right click, it's not an annoyance to either alter their settings or have to use two hands? The 'single button interface' demand is silly - all it does is force people to use modifier keys to get the functionality they need. How this is different to just enabling right-click I'll never know.
Mice that support right clicking have been shipping with every Mac since 2005, trackpads that support right clicking with every Mac since 2006 or so.