Damn, I just wasted about ten minutes of my life retexturing the NavBuoy so that it was invisible, and giving it a table which had a stealth flag. I was using it for a shoot me location for a beam. Although what I did was pretty simple, is it possible to create a SEXP which will fire a beam at a location rather than a ship? Is that too hard to ask? If it is, can tweaking the SEXP fire-beam to shoot at waypoints as well work?
I know it can be easily done by simply creating an invisible non-colliding ship, but I think this would make life easier for FREDders.