For example, for me, "Seeds" is "Udostępniających" and "Peers" is "Pobierających".. and the list goes on

Just truncate name if there's no space for it

)> Scrollbar on the right side, so that I can vertically resize window even more, while still having details after scrolling a bit down. [I know that I can hide details, but I would still prefer to scroll em out of view, than hide entirely]
)> Move torrent files [.torrent] to a specified folder, after successful download. I'm using that as "downloads history", so it doesn't really have to be exactly that, it could be some kind of list for example. Though having those torrent files archived might be good idea anyway ;]
)> Download even if there's not enough space, until there's actually no space at all [on hdd].
I often start downloading and sort out my HDD in the mean time, so that precious KB won't be wasted during that time

And if some1 chose to preallocate his files, then at least add torrent file to the queue, but don't start it yet.
)> Some kind of priorities - for example, I'm downloading 2 files, with first one having twice as much peers as the second one, and the second one, having exactly [well, not exactly, since it has 50% of those peers, but peers from file 2 are also in file 1] the same peers as the first one. So when I put first priority on the second file, then first file, won't use peers from second file. [lol, confusing ^^]
And something similar for bandwidth, if it were hit the connection limit.
That, and those already suggested - and I can finally quit uTorrent ;]