Would it be possible to auto enable a highlight rule? Via a flag in the settings dialog or another system.
Or if that would be to easy: working with categories/groups based upon file/log type.
.dat file -> auto enable dat file highlight rules
.log file --> auto enable log file highlight rules
event log -> …
But that would require an additional config layer between log & highlight rule.
It's up to you what's possible with the available development time.
We've just released LogFusion 5.0 Beta 1 (https://www.logfusion.ca/Download/Beta), and there's now a "Log Categories" feature that replaces the old Watched Folders. You can now assign column configurations and highlight rules to each log category