There is no NTSC Progressive capture preset in the traditional sense. It does have the ablitity to remove 3:2 pull down on footage that is sent to the device as 24p as 59.94. You will need to use the A frame selection tool in the Processing tab of the Blackmagic Control panel. But this requires the use of timecode and therefore will only work if RS422 device control is connected. Which obviously requires a card that supports RS 422 (Decklink HD Extreme 3D+ does).
3D capture MUST be from a 3D source. If the clocks are off on two different devices they will not capture properly.
You can playback the 3D footage to a 2D monitor if you like, but you will see split screens out of aspect. Depending on how you set the control panel you will see left/right, top/bottom, or Interleaved.
That board in particular also supports HDMI 1.4 so if you have an HDMI 1.4 TV/Monitor you can send the signal to the monitor frame packed.
Sincerely,
Joshua
Director of Support
Blackmagic Design Inc.