How to control deringing strength in MPEG2Source()

[kumi]

Hi,

I am trying to subtly dering a source. I understand how to tweak deblocking strength in MPEG2Source() with the moderate_h and moderate_y parameters, but these two parameters don't seem to affect deringing. And the default deringing strength is too extreme for my source, so I am forced to use a subsequent call to BlindPP():
MPEG2Source(cpu=4) # first deblocking
BlindPP(quant=3, cpu2="ooooxx", iPP=true) # then deringing

The quant parameter in BlindPP() very obviously effects deringing strength: is there a reason why this parameter isn't available in MPEG2Source()?

Also, is it "reasonable" for me to deblock with MPEG2Source() first, then dering with BlindPP()?

Just curious, thanks. (I hope this is the right sub-forum for this)

[Adub]

Frankly, I only deblock if there are blocks in the source. If you have blocks, then set the deblocking strength, otherwise I would just use the BlindPP(), unless you see a obvious increase in quality while using both.

[kumi]

I do. My source is both blocky and "ringy".