I am happy to point to the download point for the new Outlook Web Access Administration Tool that our team has built. The tool is an installable web site which allows one to tune OWA registry settings. To quote the install point:
It provides a list of all servers in the domain and allows administration of OWA settings on all Front-end and Back-end servers. The tool ensures that settings are correctly written to the server’s registry and provides inline documentation for all configurable features.
We'd love to hear what all you think. Have an install and let me know.