I figured out how to do a minimal silent QuickTime install. So far
this info isn't posted anywhere else, so hopefully this is helpful.
In addition to all the other settings you put in QuickTimeInstaller.ini
(Google for it... the MSFN Forums thread seems to have the most
detailed info), you can add DEFAULT_INSTALLATION_TYPE=Minimum to
silently do the minimum install. This means PictureViewer, authoring
support, DV support, and media exporters won't be installed.
So for a minimal install, create a file named QuickTimeInstaller.ini in
the same directory as your QuickTimeFullInstaller.exe and paste the
following text into it:
This was tested with QuickTime 6.5.2. Note that it will create a
broken shortcut to PictureViewer in your Start menu, so you may want to
clean that up.