Aspect ratio (?Bug?) on wide monitors (only with BSpro 1.41)

[Tntin]

Ok maybe it's not a bug (in that case, sorry! My post is in the wrong forum!)

But I would like to know how to make a "real time" pan scan with a film, (I mean: detect if a film is letterbox or full 4:3, and automatically change the display ratio on a wide screen.) (Like some 16:9 tv's...for example with my sony tv, when a "letterbox" film interrupts, to show some ads (in full 4:3) the aspect ratio is changing automatically, by detecting that there is no more black stripes at the top and bottom of received images).

If it isn't possible yet, this should be a great feature for the next releases, with some user preferences (e.g : ->if the display of the video is letterbox, do that: [some choice of video display ratios/subtitle positions, etc]! ->if the display is full 4:3, [....] )