It would be very useful if the UL format was such that it contained all updates in one file, i.e., not just the latest ones. This way users would only need to download the latest file and not have to worry about locating older versions when such may be needed.

Also, it would be nice if WUD could be made to show only updates following a given date and/or following the release of a user-selected update (for example, all updates following the release of SP3).

P.S. So where do I source all ULs since SP3?

The reason to not include all of the updates in the same UL is because Microsoft already does that with the WSUS cabs... and they're enormous and incredibly complex because they cover every possible platform released and all of the updates available since release. The WSUS cabs are also several megs in size and having such downloads associated with WUD would kill it by the enormous quantity of downloads of WUD ULs.

As for filtering by date, I can look into that.

I'm not quite sure what you mean by "source" the ULs since SP3?