Couldn't leave to finish this; four-split 3d view now syncs the ortho views to a box-view. Brings back good old Amiga Sculpt4D feeling! :) What's not done is to use the box to clip away invisible stuff. Note that it still allows to switch top-bottom, left-right or front-back. The 4th window is entirely free. Test: use shift+alt+ctrl+S. In due time will all go the headermenu, configurable, of course.