Using Ctrl-Shift-F7 will mark usages of variables in JSP/JSPX, even when the variables are defined by a custom action (tag). One major limitation is that for such variables there is no "write"/"initialization" usage highlighted. I suggest that the tag element is highlighted in such cases (either only "localname" or "prefix:localname", but not the attributes. Should only start element be highlighted, or also end element (when tag is not empty)? Perhaps for variable scope NESTED and AT_BEGIN, highlight start element only, and for AT_END highlight end element only.