Version:           kdeedu-3.4.2-0.fc4.2 (using KDE KDE 3.4.2)
Installed from:    Fedora RPMs
OS:                Linux

One feature I miss in KStars is the ability to draw my custom horizon and cutoff line (I don't know if it's the right name). What I mean is to draw the line with the buildings and trees that block my view of the sky.

I guess it's not that hard to do. I could make a 360 degrees panorama of my observing site with my digital camera and a software like hugin http://hugin.sourceforge.net/ Then, easily select the day blue sky in a photo editing software like Gimp. With this selection, convert to a Black and White image (not grayscale). The B&W image could be used by KStars to draw my site cutoff line. Alternatively the B&W image could be converted to a vector graphics (approximately, by hand or in a trace software) to be better rendered in KStars.

Well, the process it's not trivial but the cutoff line is very useful. I think, with the data in a proper format, this feature is easy to implement in KStars.