Could additional instructions like "SelectEvery" be entered somewhere???
Yes. You can add it manually.
1. Open video and wait for OSD-message "Smooth playback" (green triangle at SVP-icon in system tray).
2. At SVP-icon menu: Show - AVS-script from last play.
3. In opened script add line with SelectEvery just after ffdShow_source line and add multiplying of 2 to multinum value.
svp_scheduler=true
SetMemoryMax(1024)
svp_cache_reduce=true
svp_flow_lib="C:\Program Files\SVP 3.0.3\Plugins\MVTools2\libflowsse.dll"
multinum=6*2
multiden=5
algo=23
block=false
ml=80
search=5
sadml=100
sadgamma=1
blend=true
dist=4
pel=2
sharp=2
Recalc=0
blkh=16
blkv=16
overlap=0
overlapv=0
wid_den=1
hei_den=1LoadPlugin ("C:\Program Files\SVP 3.0.3\Plugins\MVTools2\mvtools2.dll")
SetMTMode(3,3)
ffdShow_source()
SelectEvery(2,0)
Assert(width==640 && height==272,"Frame size "+string(width)+"x"+string(height)+" instead of 640x272")
delim=":"
WriteFileStart("C:\Documents and Settings\amankovskiy\Application Data\SVP\Logs\avsFPS.txt", "FramerateNumerator()", "delim", "FramerateDenominator()")
SetMTMode(2)
src=last
...
4. Close script with saving changes.
5. Rewind in player. Changed script will be applied.
But I can not guarantee smooth and jerky free result because of multi-threaded SVP script don't like changed frame order at input. SelectEvery does change frame order. Changed script produce lags at scene changes moments at video to me at my system.
I think, restoring frame rate to original before use SVP is the best idea 
SVP would detect video and film mode within the 720p50 material automatically
It will be great, but now it is fantastic. 
