Version:            (using KDE 4.4.0)
OS:                Linux
Installed from:    Fedora RPMs

Assuming the --geometry option is supposed to work like the X option -geometry, setting initial position and size of apps where at all possible, then this option does not work on many if not most kde apps.

It works to some degree on some apps, and not at all on others.  

For one example, 

   okular --geometry 300x600+200+200

respects the size but ignores the location.  Strangely,

   okular --geometry 300x600-200-200 

seems to respect the location also (200 pixels from
lower right corner).  It respects the location if it is negative,
which means one can work-around the problem in this case.

But other apps do not support it even to this degree.  Konsole is one example, as is Kdialog.  Kate and Kwrite, though, act the same as Okular, for example.

This may seem like a triviality, but the apps do say they support it, and those who want to save locations of many sets of apps (for example, many pairs of pdf files for side to side comparisons, which I really need to do), seem to need something like this.