I really can't understand the point of setting 040 in WinUAE; the fact is that the 020 has more instructions than the 040, yet selecting 040 shouldn't make any noticeable difference to the emulated CPU speed. Therefore, 020 should be the best CPU to select.
Also, even if you have 040 or 060 optimised apps installed, they should run the same speed regardless of WinUAE's CPU selection.
