Currently it seems only the AS part of the additional runtimes are setup.

That is only the right behavior when you choose an AS installation.

For EAP and SOA-P additonal setup needs to be done.

Seam:
if it is a EAP or SOA-P it should setup seam and seamfp in seam settings (remember to give it unique names)

jBPM:
This is only for SOA-P; SOA-P has a jbpm runtime that needs to be configured out of the box too.

Drools:
This is only for SOA-P; Drools have recently added runtime support, we should investigate how that is going to be setup