Usual way is to have unique numbering for each name, something like this:
jboss-eap-4.0
jboss-eap-4.0(1)
jboss-eap-4.0(2)
jboss-soa-p5
jboss-soa-p5 (1)
jboss-soa-p5 (2)
..

In JBDS installer there is numbering like this:
jboss-eap-4.0
jboss-eap-4.0(1)
jboss-eap-4.0(2)
jboss-soa-p5
jboss-soa-p5 (3)
jboss-soa-p5 (4)

This should be changed and unified with that how runtimes are titled in JBT/JBDS via Runtime Detection. Add some brackits in JBDS would be better as well.
For comparsion of the same runtime set in Installer and JBT/JBDS see screenshots.