following changes to <tomcat install dir>/conf/web.xml are used to prevent
the need for restarting tomcat when changes are made to JSP files:

<init-param>
    <param-name>development</param-name>
    <param-value>true</param-value>
</init-param>
<init-param>
    <param-name>reloading</param-name>
    <param-value>true</param-value>
</init-param>

=====================================================================

Changes to wt.properties through site.xconf &/or command line 
xconfmanager, is a method to do same/similar.
 
com.ptc.core.ca.web.client.gw.debugMode=true
com.ptc.core.ca.co.common.config.dynamicUpdate=true
 
xconfmanager -s com.ptc.core.ca.web.client.gw.debugMode=true -t codebase/wt.properties -p
xconfmanager -s com.ptc.core.ca.co.common.config.dynamicUpdate=true -t codebase/wt.properties -p

site.xconf

   <Property name="com.ptc.core.ca.web.client.gw.debugMode" overridable="true"
             targetFile="codebase/wt.properties"
             value="true"/>
   <Property name="com.ptc.core.ca.co.common.config.dynamicUpdate" overridable="true"
             targetFile="codebase/wt.properties"
             value="true"/>