I have just downloaded your new release and was happy to discover that RTL support for the ribbon is much better! :-)
Now for a few issues I have found:
1. Contextual Tabs: When having contextual tabs with quick access buttons, if the button have text (which makes them large) they appear over the contextual tabs and hide them. This happens in both modes: RTL and non-RTL though in RTL mode it is much worse.
2. Minimizing the Ribbon: The behavior of this feature is not compatible with Office2007 behavior. In the Rad ribbon, after minimizing the ribbon, if one of the tabs is pressed the minimization is canceled while in Office it only shows the specific tab, letting the user click something and then the ribbon disappears again. Please note that when minimizing it and clicking a tab, the ribbon only "hovers" (i.e. it is not being maximized and then minimized again). In addition, I think that when it is minimized there is still a visible part.
3. Small Images: I added a button to the ribbon, tried to set the SmallImage property, but nothing happened. Moreover, I have a little suggestion. I think it will be better to have two modes: 'Large Image mode' and 'Small Image mode' such that no matter what is the size of the image you set - it should be scaled according to the mode you're in. Meaning, if I set an image for the button, and the image is 64x64, large image mode will scale it to 32x32, while small image mode will scale it to 16x16 (after selecting this image as SmallImage of course).