Playing incomplete avi

Hi all,
a doubt about new bsplayer feature.
I'm very happy that now I can see incomplete avi with bsplayer but:

- is it possible to open incomplete avi while i'm downloading it and without modify it(like avipreview does)?

- how can I know if the avi file i'm playing is incomplete one or correctly completed with index etc? In the past I used to play them with bsplayer and check it (if the bsplayer opened it it was completed, if bsplayer didn't opened it it was partial, but now that bsplayer open all files I don't know how to distinguish them).