Yes, but i can't remember how - probably a rebuild! Its possible that your suggestion is correct as at one point a long time ago I was playing with those options, but I haven't in a while. Generally, I leave all those options at the default. From what I gathered (mostly from Totallymaxed) most of them don't really do much (any more?) generally you should be able to get good playback without changing any of them.
Andrew - if you are reading, could you give an update on your position with these settings? Do you (CHT) normally change any and if so, why? If not, is it true that they (mostly) do nothing?
We always leave those settings at their defaults... the only setting we change is for 'De-interlace'... and that varies depending on the video card used and also the performance of your processor too currently.