Problem using Mosaic Screensaver

Like many, I find the Mosaic screensaver included with Leopard very cool. However, I have a problem using it and wonder if anyone has a workaround. First of all, my iPhoto library is on an external FW HD and has 25-30,000 photos. When I first tried to setup Mosaic, the test under System Prefs worked fine, but in the real world all I got from Mosaic was a black screen and a locked-up system. Sometimes I had to reboot to interrupt it. So I exported 1500 selected photos, disconnected the FW HD, and created a new, smaller iPhoto library. This worked great - Mosaic ran perfectly with no lock-up. Unfortunately, when I reconnected the FW HD, Mosaic started re-indexing and adding in the 1000s of photos from my original library. Back to square one.
Does Mosaic have a preferences file or some other way to set a limit on the number of photos it uses, or to turn off re-indexing when it detects new photos? Anyone have a similar or larger number of photos and doesn't have this problem? Any other solutions?

I guess I'm not making myself clear. This is not an issue with managing iPhoto libraries or albums. I've used iPhoto Library Manager, iPhoto Buddy, and my library has dozens of albums. I know how to select a library by pressing Option + iPhoto, double-clicking an iPhoto library, etc., etc.
I apologize for not making myself clear. The problem is not with managing iPhoto libraries, rather it is with Mosaic automatically updating its database when it detects an additional source of photos. Let me explain again:
I have one large iPhoto library on an external HD, and a small library on my main HD. I setup Mosaic using the small library and with the external HD detached from my laptop. Under these conditions Mosaic works fine. No problems. However, if I run Mosaic with my external HD attached, the screen goes black and the message "Creating Mosaic Database..." appears together with a progress bar. All of this occurs without iPhoto running at all. After a long wait the database update finishes and Mosaic will no longer run because there are too many photos in its database (I presume). THIS is the problem.

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