Thanks. I've found a jbossjta-properties.xml file that appears like it should work, but it is either the wrong file or I have been adding the parameters incorrectly.
I've tried adding the following under the <properties name="common"> section:
<properties name="javaagent" type="System" value="D:\Kronos\jboss\wily\Agent.jar">
<properties name="com.wily.introscope.agentProfile" type="System" value="D:\Kronos\jboss\wily\IntroscopeAgent.profile">
I've also tried adding the same under it's own <properties name="wily"> section, but that didn't work either. I found these files under D:\Kronos\jboss\server\wfc\conf, as well as D:\Kronos\jboss\server\default\conf. I have put the parameters in the wfc subfolder, but should it really matter?
Again, I apologize for my general lack of understanding on this, but it seems I really need someone to spell it out for me.