temporary dual monitor setup

[Marco]

Hello,

I have a large external flat panel for my laptop. I use a dual screen setup
with Xinerama in my xorg.conf. That works fine but I want two improvements.

Can I assign KDE virtual desktops to the screens? That way I could switch
desktops on the large screen and have the small screen permanent to monitor
something or watch TV or whatever.

How can I assign key shortcuts to switch to another display setup? If I am
on the road I need to switch the setup to only use the laptop display. This
is even more important as the KDE panel is only displayed on the external
Monitor.

It would be great if I could do it without a reboot. But a the moment I
don't know how to do it at all. The settings are in xorg.conf. Can I define
different profiles there? How could I switch them?

Thanks in advance.

Regards,
Marco