Hmmm.
Absolute addresses is a bit of a pain in the ****.
It wouldn't be hard to create a small program that adjusts all of the paths before transferring, or what would be better is if someone edited the source code of the emu
As for updating them, WHDLoad tends to only get updates every now and then, but there are functions (such as the newly added global save directory for highscores/gamesaves [not savestates]) which would make it worth updating.
It's also worth noting, that whilst I would be willing to host all of the games from my whdload site, I wouldn't be willing to host them if they contained kickstart images. The Amiga scene is a strange one where companies actually actively seek out kickstart sharers and cause them trouble. I've had a little trouble in the past with similar issues.
I know it wouldn't be hard to get them shared elsewhere but my main aim was to whack them all on my site, and then just share the whdload.hdf elsewhere.