I'm sure you will be ecstatic* to learn that the new LimeWire beta (2.7.0) includes the ability to force incomplete downloads (as shown in the library) to resume.

I've only just got this and I'm still playing...

I think the resume will resume from zero - if the downloads.dat file is corrupt then LimeWire has no way of knowing which bits of a file have been downloaded.

But this does save having to search for the files you were downloading and starting them manually.

Mark

*It certainly pleased me a great deal.