I thought I had, although I gave up on it because of a number of bugs in Guvnor 5.5, which I couldn't live with.
However, recent exchanges on this list have me second guessing myself, and I'm wondering whether it was only 5.3 that I got working properly. I think I might have to try again.
The scripting I did is here:
Basically, as long as I was using the WAS 8.5 Liberty Profile, everything was pretty simple. The only odd thing I had to do was to deploy Guvnor in exploded war form.
However, older versions of WAS were giving me trouble due to the dependency conflicts Mike mentioned. Likewise, I suspect that the newer non-LibertyProfile versions probably suffer similar issues, but I wasn't able to get hold of one of those to check. My thinking is that because the Liberty Profile doesn't load many dependencies unless you specifically configure them, such clashes are minimised.
I'll be 'unemployed' again next week, so I should probably try to spend a little time double checking this and knocking up a little blog post. :)
Steve