Well, first of all, big thanks for mouse controls <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) -->. Then, I think since it is possible to use mouse in menus I think they should have"back" item or an icon (like curved arrow); also it would be good I think to make RMB act as "back" in menus.

That's missing from the implementation yet, but it's not very difficult to add IMO.