A nice feature, indeed.
We artucally facing another problem with dynamic proxy generation - we are using Boo language as a scripting language, and Boo can not cope (or probably .Net itself) with making links from static types to transient (from in-memory generates clasess, and those loaded from disk).
So this tool would solve our problem.
Another possible solutions would be to force NHibernate to generate proxes on the fly, persist them to disk, and load from disk, so that proxies would not be transient.
This of course goes out of this tool scope, so enough of this :)
This has worked flawlessly for my project and truly saved me. I simply add the call to build the proxies to the build script and I completely forget that it is there. Perfect.
I thought I was going to have to abandon NH when we had to go to medium trust. Big thanks!