Launch regedit and navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Apache Software Foundation\Procrun 2.0\{TomcatInstance}\Parameters\Java\Options where {TomcatInstance} is the name of the Tomcat instance you want to configure.
Separate each JVM option on a different line:
-Dcatalina.base=C:\java\apache-tomcat-7.0.47-Dcatalina.home=C:\java\apache-tomcat-7.0.47-Djava.endorsed.dirs=C:\java\apache-tomcat-7.0.47\endorsed-Djava.io.tmpdir=C:\java\apache-tomcat-7.0.47\temp-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager