You have two options: you can use a message handler or you can use an intermediary. Both of these approaches allow you to add and process SOAP headers in your message. If you have any requirements at all to support interoperability, then you should make sure that your security header conforms to the OASIS WS-Security 2004 v1.0 specification. (See http://www.oasis-open.org/specs/index.php#wssv1.0).
I must warn you, though. The native SOAP engine in WAS 5.0 is very limited in its capabilities -- especially in terms of advanced features and interoperability. (It predates the WS-I Basic Profile.) I encourage you to either upgrade to WAS 5.1 or later or to install a third party SOAP engine, such as Apache Axis (open source) (see http://ws.apache.org/axis/) or Systinet Server (commercial) (see http://incubator.apache.org/synapse/) is an open source intermediary, and it can work with WSS4J -- but be warned that the code is still very early stage (as of January 2006). You can also use a variety of commercial products from web services management vendors such as Amberpoint, Blue Titan, SOA Software, and Sonic Software (Actional). Or you can use a hardware-based XML Gateway (an appliance) from vendors such as IBM/DataPower, Forum Systems, Layer 7, and Reactivity.
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