That would be even worse! I've just check cdtweaks using git/folder compare and this is what I found:
You want to be horrified, look inside the '/deity' folder before and after installing Faiths & Powers.
Regarding lib\pnp_dual_core.tpa and \lib\pnp_dual_working.tpa changes case, what would be the effect of coping cdtweaks folder (skipping backup) after it was installed, and use it for another installation?
Why do that? It's easy enough to just grab a clean copy of the mod for that 2nd install.
More generally, lots of mods NEED workspace to do things before the final install into /override... surely it's better for such operations to be contained rather than polluting the player's game folder (where it would be easy to delete or alter them).
Rather than impose rules on how modders can treat their own mod folders (I mean come on, if that's not a space I can work with as I see fit, what is??), why not simply add an automatic function to Weidu to back up a clean copy of the mod before it installs? Then you can simply grab it from that backup location.
(Players can/should do this themselves, anyway. I have extracted copies of all mods I intend to use (in folders numbered according to install order, yeah I'm anal), and I only
copy (not move) the mod folder into my game folder when I'm about to do an install. I know BWS doesn't do this... to its detriment IMO. It seems like it would be a trivial thing to add. And more generally the entire functions of 1) downloading mods and 2) installing mods, should be more distinct.