BRMS and BPMSuite 6.4 provides new wars for EAP7.
It can only run by
bin/standalone.sh -c standalone-full.xml

Error will occure if you start from standalone.xml. This is caused by the additional configuration(subsystem, sso configuration etc) needs to be added into standalone.xml and delivery along with EAP 7 new war.
The fixes might include:
1)Add properties to standalone-* xml to support BxMS runtime choice
2)Add messaging subsystem for standalone.xml
3)Add sso configuration to enable dashbuilder single sign on feature.

Also please enable the security startup script and ship with EAP7 packages.