At present, you can tell ktorrent to fully pre-allocate the files of a torrent before downloading them. This is a great feature and helps make sure that you don't download more torrents than you have space for. However, this runs into a bit of a snag when you have torrents queued which haven't started yet.

At present, the torrents don't actually allocate any space until the torrents actually start - which they don't do while queued. So, you can queue up a bunch of torrents and then run out of space when they finally start running and try to allocate disk space.

It would be nice if there were an option to make it so that torrents had their space pre-allocated as soon as they were added to ktorrent as opposed to when they start. It wouldn't surprise me if someone wanted the current behavior rather my suggested behavior (presumably they'd be moving torrents out of the way either manually or by having them move when they're finished), so making it so that pre-allocation happens when adding the torrent the default might be a bad idea. But having it as an option, is definitely something that I think could be quite beneficial.

As another option, perhaps there could be a menu option (when right-clicking on a torrent) to make sure that all of its space has been allocated (allocating space if necessary or doing nothing if it's already been allocated). That would be a little more tedious if you're adding a bunch of torrents, but it would solve the problem and possibly less intrusively.