How to add a blockquote button

All I had to do was add blockquote to one of the button toolbars, so in admin/settings/tinytinymce edit the Init script for advanced mode and add blockquote on the end (or wherevever you want it) like this:

theme_advanced_buttons4 : ",styleprops,|,cite,del,ins,attribs,|,visualchars,nonbreaking,template,pagebreak,blockquote",

It seems to work OK - I will add this as standard to a future release.