The extended logging checkbox can be enabled, then edit the conf/logging.xml file.

Here is an example config for logging to a SysLog server:

<?xml version="1.0" encoding="UTF-8"?>
<Syslog defaultMask="INFO">
	<Logger name="UNIXSyslogLog" class="com.protomatter.syslog.UNIXSyslogLog">
		<logServer>172.16.247.130</logServer>
		<Format class="com.protomatter.syslog.SimpleSyslogTextFormatter">
			<showChannel>false</showChannel>
			<showThreadName>false</showThreadName>
			<showHostName>false</showHostName>
			<dateFormat>MM/dd/yyyy HH:mm:ss</dateFormat>
			<dateFormatCacheTime>1000</dateFormatCacheTime>
			<dateFormatTimeZone>America/Denver</dateFormatTimeZone>
		</Format>
		<Policy class="com.protomatter.syslog.SimpleLogPolicy">
			<channels>ALL_CHANNEL</channels>
			<logMask>INHERIT_MASK</logMask>
		</Policy>
	</Logger>
</Syslog>