That would definitely help I think. Apart from making non-interlaced Super72/HighGfx screens look better, it would avoid the "screen bounce" which happens with interlaced Super72 modes. (On a screen mode change WinUAE doesn't know whether the new mode is interlaced or not, so for a moment the new mode appears half-height before expanding to fulll height.)
But the number of lines is related to the line length and frame rate. And frame rate is usually somewhere around 48-75 Hz (say). Which modes would a simple VTOTAL check fail on?
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