Log Configuration with Config Tool

You can perform the following log configuration activities offline (that is, without AS Java started) :

Adding, editing, creating and removing log controllers, destinations and formatters
More information:

Adding, Editing and Removing Log Controllers

Adding, Editing and Removing Log Destinations

Adding, Editing and Removing Log Formatters

Caution

These activities have to be done with extreme care and only by users who are familiar in detail with the SAP Logging API. More information: SAP Logging API

End of the caution.
Switching on/off the writing of trace messages to one file, or exclude certain locations from being written to one trace file. You can do these tasks via the Log Manager's properties ForceSingleTraceFile and SingleTraceFile_UnrestrictedLocations, correspondingly.
More information: Log Manager