TeX flags errors by a line that starts with "! "; but the LaTeX Log format doesn't treat them as anything special so there's no way to make them stand out. Could we change the invalid.illegal definition to the following

        {    name = 'invalid.illegal';
            match = '.*Error|^! .*';
        },

or something along those lines? And while I'm on the subject, the firstLineMatch seems rather restrictive. Could it be generalised to:

    firstLineMatch = 'This is (pdfe)?TeXk?, Version ';

since not everyone uses non-standard extensions (the 'k' suffix) nor even PDFTeX?

Robin