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Thanks for asking.
Depending on the version of Aurora you're using, the application carries a different bundle identifier (the ID that uniquely identifies every application):
1) de.metaquark.Aurora for older versions
2) com.metakine.Aurora for newer versions
Currently, Remote Buddy ships with the behaviour for older versions and offers to install a Behaviour for the newer version via its Online Updater when it finds a newer version.
Unfortunately, Apple doesn't allow any sort of Online Updater in Remote Buddy Express or any other Mac App Store application. Therefore, you'll currently have to manually download and install the Behaviour for newer Aurora versions:
1) Download the Behaviour from
http://www.iospirit.com/static/objectfiles/file/156/Aurora.rbscriptedbehaviour.zip
2) Unzip the file
3) Install the Behaviour by double clicking Aurora.rbscriptedbehaviour in the Finder
Regarding the Accessibility Behaviour: this Behaviour, like the Behaviours to control Exposé and Spaces, are only available when using Remote Buddy under OS X 10.4, 10.5 or 10.6. Due to changes in Mac OS X Lion, they're not supported under OS X Lion. I've included that info in the release notes for version Remote Buddy 1.18, but only now noticed that I haven't also added that info to the list of Behaviours on the product page. I'll add this information right after posting this message, though. I'm sorry for the inconvenience this caused you!
Best regards,
Felix Schwarz