Different server layouts for different users. Possible?

[ranmakun]

Hi, I hve the following problem, I have a proyector where I watch movies conected to the DVI port of my video card, my monitor is connected to the VGA port. I've already made a server layout were the proyector is an extension of my current desktop, it works great.
The problem I have is that since it's an extension my mouse goes out of the screen (to the proyector) when I touch the right border, this is very annoying in normal desktop work.
So I was thinking I could have a special user wich would have a special server layout and could launch movies using that user. But I don't know if this is possible or not, coulnd't find any info.
Or do you have a better solution?

BTW I'm using KDE/KDM
Thanks