hp-* programs should not enforce having a GUI

This is not an actual bug but more an annoyance
and I ask for an enhancement to avoid it.

hp-* programs should not enforce that the user has a GUI
when a GUI is not really mandatory for the program.

Example:
I am logged in from remote via ssh
-------------------------------------------------
# hp-diagnose_plugin

HP Linux Imaging and Printing System (ver. 3.13.4)
...
warning: No display found.
error: hp-diagnose_plugin requires GUI support . Is Qt4 installed?
-------------------------------------------------

When I run hp-diagnose_plugin when logged in
on the machine having X running, it outputs only
plain text so that from my point of view
it seems a GUI is not mandatory for it.

For example hp-setup has the "-i" option to run without GUI.

But that option is not shown by "hp-diagnose_plugin -h"
and it really does not work for hp-diagnose_plugin:
-------------------------------------------------
# hp-diagnose_plugin

HP Linux Imaging and Printing System (ver. 3.13.4)
...
error: Only Qt4 GUI mode is supported
-------------------------------------------------

Please check all hp-* programs whether or not they
actually need a GUI to run and if not please provide
the "-i" option to run them optionally without GUI.