bcam-
Of course, you're right. No need for any adjustments by TheWEF. The best way I've seen to do the credits was to follow a suggestion from TheREAL (I think), by using the Coring Filter (VDub only) as well as a very strong Temp Smoother. It takes care of those scrolling white on black credits, and even at Quant 31 they remain legible (usually), and without that trailing white stuff you get at high quants. Sometimes they get skinny and start to flash a bit, so you lower the quant.
So, you get the
Coring Filter, and encode the credits in VDub with BilinearResize, put on the temp smoother very strongly, and set coring to 64. Unless and until someone ports this to AviSynth, you'll have to do it separately, point GKnot to the credits.avi before encoding the movie and adjust the final file size accordingly. At least I think that's how you would do it through GKnot. I always join the movie and credits myself.