You can use an extra ship to mark a way-point in Deep Space, a Merlin at Warp 0 for example... then other ship way-point orders can easily 'click' to that point in space avoiding scrolling in or using the arrow keys each turn.
Also there is already a mod that you can use to draw on the Starmap, good for drawing on border agreements, and should suit your needs also.
http://planets.nu/discussion/utility-script-draw-objects-on-map http://userscripts.org/scripts/show/133919 |