I would like to see, in a merged view, the messages colored by which log file they came from - not by log level. There is a colored bar on the left of the logging messages which colors like this, but it doesn't seem to be possible to color the messages like this? 

Yes, this works, thanks. I couldn't find the dialog in your last screenshot to save the rule as an automatic template, however.

The last screenshot is page 2 of the Rule Wizard.  You could also use the Rule Manager which uses the term "Parser Rule" to define an Automatic Template.

Thanks

Glad that helped - thanks for letting me know!