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[nikio]

Your idea (finish chunk before shutdown) makes no sense.  Please please please take your time to understand following concept.

Case A - commonly available file.
[...]
Conclusion - no impact for any given client.

no objecton - if a file is widely available, there's no real need concentrate on details...

Case B - rare file (#2 doesn't hold)
Property #1 (file is rare) - there are many clients in queue
For rare files  situation is different since dropped client will increase time in queue for .

i'm confused, could you explain a little more the queue point?

But, due to #1 it doesn't matter whether one of many waiting clients got the chunk - on average everyone is screwed.

well if one or two of the clients got the full chunk they can continue spreading it until I'm back online

But, most important, both case A and B lay on the assumption #3  T>>t,  there is a not irrelevant percentage of people that use file sharing programs (T) only one or two hours a day, not more tha four hours anyway, considering an average "t" about 30-40 minutes (that is absolutely sensible in Italy and, I think, in Europe),  you  can easily see that the impact is not irrelevant in these cases

[lfroen]

But, most important, both case A and B lay on the assumption #3  T>>t,  there is a not irrelevant percentage of people that use file sharing programs (T) only one or two hours a day, not more tha four hours anyway, considering an average "t" about 30-40 minutes (that is absolutely sensible in Italy and, I think, in Europe),  you  can easily see that the impact is not irrelevant in these cases

Read again:

average client-is-online time T

Not a "percentage of people ", which can't be compared with "t" in T >> t.

All P2P ideas based on fact that T >> t, since in opposite case clients will not be able to complete exchange of chunk (takes time t) before they go offline (T expired).

Rest of your post is meaningless. Do the math. Use right units on right variables.

[Morse]

lfroen has one irrefutable argument on his side: ed2k works! so it would be silly to prove that it couldn't work without this feature - it's working already.

besides, talking about averages: amule is very rare (no offense, this is the fact), so any feature like this (even if it would be VERY useful) will cause no impact on net at all.

[Stu Redman]

Especially since nobody would use it. 

[lfroen]

lfroen has one irrefutable argument on his side: ed2k works

I guess math doesn't count as "argument"? Get a clue, it's free.