This is actually kind of funny, because buttons is the feature we have been working on this week. It's good that you took an initiative though, because it will not be possible to include buttons for the content namespaces, since these are admin-defined and there can be more than one. Admins will have to add buttons for these additional namespaces using the Custom BB-Code Manager.
In any case, Wiki Code Buttons were a feature we were planning to add for the next build, so this is definitely going to be addressed.