If an EAP 5.2 server installation is referenced (Preferences->JBossTools Runtimes), the runtime is correctly found by JBDS and listed as a runtime to be scanned at startup - but - the corresponding EAP 5.2 server instance is not automatically created. The user must create this server definition manually.

JBDS 5.0.0, and 5.0.2 is able to both create the runtime and automatically create corrseponding servers for EAP 5.1 and EAP 6.0 - the issue seems to be limited to EAP 5.2

JBDS 6.0.0 is able to both create the runtime and automically create corrseponding servers for EAP 5.1, EAP 5.2 and EAP 6.0

See attached screenshots.

(Thanks to Eric Schabell for finding this one!)