Hi Rob,
Thanks a lot for your insight. I kind of acheived what I want using a mechanism of extension points like you already have for beahvior.
I tried to create two new extension points serverTypesExtesion and runtimeTypesExtension, these two extension points would allow the extenders to add their Custom JBoss servers as the alias for the serverTypes/runtimeTypes defined in the jboss.as.core plugin. then i made a small tweak to the XPathModel static method where you set up the rtPortsFile Hashmap to add the extended runtime ports. There you go i was able to see the default ports coming up.
If my approach above sounds good to you, i can open a ticket and I can contribute a patch and we can take it from there.
Right now I am facing the same issue with the Pollers :( , trying to write my custom Poller as again we have the id checks... Do you have any thoughts around that.
--Kamesh