Using specific Http / https ports in ServiceBinding in JBoss EAP 5

Issue

I have installed jboss eap 5.0 GA. I will be starting servers - server, server1, server2, server3 with ports-default,ports-01,ports-02,ports-03 from command-line. Currently my http port is

48180 for server1
48280 for server2
48380 for server3
48480 for server4.

I want to change it to

48180 for server, 48181 for server1,
48182 for server2
48183 for server3.

I would like default offset to be applied to rest of ports. How will you do that?