i think in the codebase there is an entry for DB Classic... the code actually works better in DBP... that the program you create you can actually have settings, and the preview window working (that is what it says, never tried it)...
but i believe that all DB created programs can be made into screensavers (i know DBC can), just by renaming it from a .exe to a .scr... but without the code thats in the codebase, when in the display properties (when it loads the preview screen) it will launch the entire program instead of in the little screen.
i might mess around with it... test it out and post my findings here.