Have found that a thread will not work to write the infos in the script editor.
All outputs will be frozen till the renderer is working and the scene in unlocked.
Now i paint direct over the Softimage UI which is working and looks like in the image below.
You can also send this infos into the script editor, which you can enable with the "Log Changes" option and is shown when the renderer starts to render. But this will only be an additional info to see the steps of the update sequence and to check if the changes you make are catched.
The paint over will ever work and can´t be disabled.
Hope you like it,
face