It might be done automatically by making the parent of the submenu in question a "categoryFolder" by putting rel="category" in its attributes field, then in the categoryFolderTpl use a standard rowTpl structure except with a separate Wayfinder call, with some clever manipulation of its tpls and with the ordering you want, instead of the [+wf.wrapper+]. I'm pretty sure that this would cause it to lose the "active" class, though.
As far as drag-and-drop for Evo, check the Sort Menu Items tab of the DocManager module.