It should be possible to open a chatwindow with the one you are downloading from. Then you might ask if he could let it on for a pfew more minutes or so becouse i was downloading and it was abot 1 minute remaning and the dude went offline.. [i hate that].
Then another feature could be a counter that show how much Kb you already have from a file you are downloading.

the system where you could download partial files its good but i was wondering if the system allows the one with the biggest partial file to download from the one with the full one... then the others could connect on the other dude so that you could form a chain... and that it would go much faster.

Xolox already does that (partly). Ever noticed that some files did have a rank of

1 (+ 2 parts)

or something like that? That means that there is one guy who has the actual file and two other guys download it just now from him. Since Xolox does partial download it will also try to download from those latter two guys...

You see, Xolox is pretty smart.