downloading files 1 at a time in a torrent

is there any setting/plugin for azureus that'll get it to download files one at a time from a torrent automatically, right now the only way i can figure out how is manually setting "high" priority till each is done.

also, is there a way to have it download a file from beginning to end, i.e. so a video can be previewed before it's done?

and if azureus can't and there's another client that can, link plz :D

>>1
Write one if you want it. That's what open source is for.

>>2
The actions of one peer is not going to unbalance a swarm.