As Gary points out, KONA 2 lists its modes by their FRAME rates, so in this case your “1080i50” (50 Fields/second) would use the settings labeled “1080i25” (25 Frames/second).
The HDV Codec is not fast enough to do realtime capture. You will have to capture your other sources in another format (e.g. Uncompressed 8-bit) and then render.