DisplayFusion unfortunately can't combine monitors like Surround/Eyefinity does. Does your card support Surround using 3 monitors? If so, you may be able to connect the fourth monitor using a USB video adapter, though it wouldn't be part of the Surround group.

Alternatively, you could get a card that can do Eyefinity with four monitors, like this one: http://www.amd.com/us/products/workstation/graphics/ati-firemv-2d/2460-mv/Pages/2460-firemv.aspx

I've got that card here, and it works great, though it's not a gaming card by any means.

Hope that helps!

You can do that using a custom Function that you can call from a Window Location rule. Check out the second screenshot in the following How-To guide: http://www.displayfusion.com/News/2013/10/working-with-custom-functions/

Just create a Function similar to that one, then create a new Window Location rule that runs that Function.