Thanks for the detail response.
I am a happy user of BitComet, so I am not complaining about any thing. I understand your point, But my point is different.
Let say the torrent size is 100GB, containing 100 files and seeder is not continuously seeding. Now If I want to download all, and don't want to waste time waiting for the whole download to complete automatically. Then what are my options:
I have to choose and prioritize, with out knowing which file availability is high.
So if availability feature is available then I can pick better one, Right ?
Thanks
Quakze