The site I am downloading from updates its passwords every 
few hours, so when I cancel the download, and replace the 
old password with a new one in the text source file (in 
the format user:pass@url), resuming the download seems to 
think all the urls are new and starts downloading from the 
beginning again, instead of from where it left off.

Am I correct that the only way to pass a password is as 
part of each URL (rather than in a global password setting 
somewhere in options), and is there any way to stop it 
from starting the download from scratch again each time 
the password is changed?
Thanks!