The latest 10.5 EAP starts with two very powerful new navigation aids:
Go To: Related File
Did you already try the new "Go To -> Related File" menu-entry in IDEA's 10.5? Struts 2 plugin now supports this very helpful action for (web-)files used in <result>.
Go To Result
Also the other way round is now available: just click on the "result" icon from your action's method(s) to quickly open any associated result.
Now you can quickly jump forth and back between your JSP/VM/FTL-file, Action-class and struts.xml in any direction.
Please see here for a detailed list of all changes.