after the next release (or if you're using one of the betas already) you may want to try adding a wget macro to your right-click menu, as described at the end of this thread:
http://kmeleonbrowser.org/forum/read.php?f=1&i=4252&t=4252
since it can easily be used or not used that way, and it's quite stable over flaky connections (and does re-attempts and resumes).