If you use the QT Flash handler you can do some of that but it will require you to have QT installed on the machines.

Otherwise you are correct... there just aren't a lot of tools that will work the same on both including the Flash projector itself (the Mac version will be subtly diffrent and you can luanch applescripts from it-does mostly what you are mentioning, but the FS Commands are different).

The link you provided also makes apps that work in the Unix environment. There isn't even a projector option for Unix environments abnywhere. Also note that this supports Flash!!!
from http://www.runrev.com/revolution/inf...yfeatures.html

Multimedia support

Import, export, and display sounds, QuickTime and QuickTime VR movies, Flash, images, HTML, and text.
This product actually can use Flash so I'd say look into it. There wouldn't be any difference than using this over a projector enhancer. In fact I'm all for traditional Multi-Media Tools that Support Flash used in place of the projector. MMB is another great one (Although MMB is Windows only).