> Is there a way to run the Firebird Installer in non GUI mode and choose the "client only" option?

Yes. There is a file called "installation_scripted.txt" in the CVS
repository discussing various switches etc. in detail. You can browse
the CVS repository with FishEye or for this particular file (watch a
line break) here:
http://fisheye1.atlassian.com/browse/firebird/firebird2/builds/install/arch-specific/win32/installation_scripted.txt?focusedRev=HEAD



--
Best Regards,
Thomas Steinmaurer
LogManager Series - Logging/Auditing Suites supporting
InterBase, Firebird, Advantage Database, MS SQL Server and
NexusDB V2
Upscene Productions
http://www.upscene.com
My blog:
http://blog.upscene.com/thomas/