PLEASE Give Us All Penumbra Objects, Items, and Creatures In Level Editor

[Petike]

But if it's DLC that you have to pay for, people who want to play mods with those assets in them would have to get the DLC as well.

Hm, that's true. But if they would be included in a stand-alone mission pack (for the specific fan mission), it wouldn't be neccessary.

Take a look at this neat programme for Thief 1-3 FMs :
http://www.potterdevelopments.org.uk/fm/main.pl
It's called Garrett Loader. It installs Fan Mission (FM) content by creating a backup zip for the original game files (+ your saves) and then replacing them with the corresponding custom files and new content from an FM pack. It's fully automatic, so you don't even need separate installs for the original game. You simply select an FM from the FM folder you made for them, you press Install, wait a few seconds (depending on the size of the FM zip), and you're ready to play. Don't worry, you can select the backup pack with the original game files at any time and flawlessly re-install the game to it's usual form. And if you already have an FM installed, but want to play another, you simply select it and and install press Install. So, there's no need to restore the original game files before installing a new FM, the programme handels the entire file-swaping, packing and repacking operation by itself. It's really very easy and reliable.

I think a similar programme would work well for ATTD FMs.