Currently we can export a JBoss Tools server definition using the default WTP server panel.
There right clicking on the server opens a context menu whose last item is "Properties".
Clicking it opens a panel where the "Switch Location" button cause the server definition to be exported from workspace metadata to "Servers" project.

The problem is that doing so resets the launch configuration to the default values loosing any customization the user could have done.

The "Switch Location" function for JBoss Tools server definition should not loose launch config customizations.

(This is not strictly related but while you are at it, in the "Export Launch Configurations" panel the "JBoss Application Server Startup Configurations" items are missing the icons).