SInce I use Debian, I don't know if this will work for you but...
Programs I compile myself (I'm working on KPovModeler at the moment) Go in /usr/local/kde/
So what I do is add
to my ~/.bashrc fileThis doesn't affect my kde install, and new programs I compile work under usr/local/kde.
Doesn't Madrake have a edutainment download for KDE? because kstars would be under that and It would install properly then