LogFusion has problems with datestamped and rolling logs, that is, logs that have file names like SomeLog_20120517.log or SomeLog.3.log for example. Whenever you open such a log for the first time, you have to copy the highlighting rules from another log.

I have a feature request: When you add categories support, each category could have a list of file masks (or regexes), e.g. "SomeLog_*.log". If the mask matches a particular log, then the category is automatically applied to that log.