Problem with tinymce Editor in Q&A plugin

Two questions:

1) I use some custom buttons in TinyMCE editor in my admin area. This button also shows in Q&A plugin. Is possibile to disable them?

2) When I try to switch from Visual to HTML a JavaScript error blocks the editor.

You could find example here: http://wn.caccavella.com/questions/quando-uscira-la-nuova-versione-di-ios/