If I make a map, the most time consuming and most problematic part is when I draw borderlines next to an other territory's border. It needs a lot of time, and the result is never perfect, always there are very small holes between the two border. Especially because when I draw in Inkscape with 1.4 width lines, and I dont see the holes, but when I upload to the warlight editor, the holes become.

I tried to draw regions in one piece, and after used the cut path and split functions to divide the region into territories, but the inserted borderline after the split assigned only to one territory, and the other territory just cutted with a straight line. So still remained the hand-drawing solution.

Are there a way to make perfect borderlines easily? Or this is just a dream?

There's no perfect solution, but some people have had some luck with Path -> Inset. But Inset moves all the borders of a territory, you can't tell it to just move one side.

Another thing you can try is this: http://warlight.net/Forum/Thread.aspx?ThreadID=1996

If you're just starting a new map from ground up, I was thinking about first drawing the shapes of bonuses (or using Path -> Cut to separate a large chunk into smaller ones), then inset them (to make borders not overlap), and then to use Path -> Cut again to split each bonus into territories. Never tried it though.

That is obviously only viable if you're just starting the map, if you already know how it's going to look, and if you're drawing (or tracing) it by hand.

Another solution is when you not drawn sinuous lines, just angular lines by clicking straight sublines. This is good against the small holes, but not results realistic crooked borders.

Unfortunately the inset not works in every case, and the second solution is good to fix the very ugly maps, but it results not perfect borders too, the small holes are already here as well.