Hi Marius - Tat is on the money (as usual )
Erik wrote me a jar file to run as a JavaExtension to do just that - write to the server log. I wanted to output TI vars to something easier than a flatfile. Great for tracking params in processes.
Works a treat with Pulse Message Log as you can filter out all the junk when running your TI.
Suggest you get in touch with Tim/Erik.