Another request for a tick box to enable/disable the resizing (like you can with cropping). If you're resizing it's great and you can rely on MeGUI getting the SAR right... if you don't want to resize (most of my encodes are done to 1/3 or 1/4 DVD so I've no need to resize) then you have to work out the SAR yourself... and there's still confusion in that respect.
Case in point -
http://forum.doom9.org/showthread.php?t=106656