Hey, bungy!
If you're using S&T 2010 (not sure if this works in earlier version?), you can merge stops on the route. You know how you can grab a stop with your mouse and move it somewhere else on a map (thus changing the route)? Well, if you do the same thing but move it along the route and drop it onto the next stop, S&T will merge those two stops into one. So, if you do that with stops 19 and 20, you'll get one stop that says (19-20). You can merge more than two stops (i.e. have 19-23 merged together) if you want.
By doing this, you cut down on the number of stops cluttering the map. As well, you can change the title of the stop(s) in the Route Planner panel so that they're more descriptive (e.g. from "near Sometown" to "stop for a break here"). Just right-click on a stop and select the "Rename" option. If you don't want any title for the stop, change the "near Sometown" to a space. (If you just remove the "near Sometown" and hit enter, you'll get "Untitled" instead.)
Those two suggestions don't directly answer your question (because I don't know the answer to that one! ), but hopefully it'll make your make your maps a little cleaner.
Hope that helped...
Regards, Chris
P.S. Yes, an 18-day, 7000km trip IS alot of work!
P.P.S. Thanks to Larry for showing me those two tricks!