Please do include this combined use. I'm having troubles with overlays in softwares like MS-Office when the blank screen is on. The overlays don't show anymore until I turn off the blank screen. Other than that everything is working fine.
We are going to re-write the blank screen feature anyway, so this ability will most likely be included.
I think Capture Alpha Blending should be a stardard setting auto enabled.
We'll certainly consider making this a default setting. Meanwhile, you can simply enable it in Tools -> Default Connection properties and from then on all new connections that you create in the Viewer will have this option selected.
Unfortunately, it is how it works on Windows 7. The new monitor driver that we implemented in the recent beta version and that fixes many issues with "blank remote screen" feature only works starting Windows 8/10.