Which will look better on a computer - which I might add is going to interpolate anyway? Widescreen TVs have not yet been refined. I can switch my monitor's resolution to 320x200 and have no scanlines on it - picture information will be as dense as it is at 1152x864. If I want to play a game that's in 320x200 do you think it'll look better to interpolate it to 320x240? Of course not! It'll look horrid. All you're complaining about is a limitation of the current technology that doesn't allow TVs to switch between resolutions the way monitors do. One day that will be corrected. Until that day it's no use adapting bootlegs to look better on today's technology at the expense of what it'll look like on tomorrow's technology.
And for that reason the resolution should not be changed. As for the 5.1 remix, the argument is simple. Anyone with a surround sound setup can enjoy the Dolby-Prologic-II soundtrack in all it's glory. The 5.1 the DVDs are using, I'm assuming, are down-converted from 6 or 8 channel surround sound. You cannot up-convert surround sound. This is why I hated our local release of The Terminator - it's remixed using new and different sounds. Okay it's a great soundtrack, but they didn't give us the mono track which was the original track experienced in cinemas, and the original part of the film. They didn't make the 5.1 using just the soundtrack, or even using 100% existing material. Why not? Because it's hard enough to convert mono to stereo let alone 5.1. Converting 4.0 to 5.1 is just like interpolating non-anamorphic to anamorphic. Okay so all the sounds are there and you aren't creating mid-way pitches; that's not what I mean - what I mean is all you're doing is spreading the original material out, thusly leaving gaps filled with the interpolated stuff. Therefore it will never sound as good as the original Prologic-II soundtrack.