IIS Proper doesn't support the DELETE verb.  But our base handler will route a POST with an _method=DELETE param value to a delete method in the handler.  We should bake that logic into pdp-data.js _callHandler() function as we have on other projects.  When it sees that verb, it should automatically add the right qs variable.  I'll open an issue to that end, but note that this won't work on a Jenkins install