The project is now on GitHub too! (Link on the first post) Thanks to davidoster for helping me with this!
This should make easier for anyone who wants to collaborate, but keep in mind that it's just another option. I am still available by pm, email or this thread for any questions, suggestions, ideas or code you may want to help us with!
On other news, I have some new features in my head so as soon as I get some free time, I'll implement them and upload the new version.
I'll keep you posted!
Edit: Quick update on the set_soft_delete function. Now you can set the field and the field value. Documentation updated accordingly.
Edit 2: Added some new functions. They allow you to create "callback stacks" so you can run more than one callback function (useful for example if you want to add a callback after insert for tags, another for an image gallery and one more to create a log.)
Also created a post_render callback that let's you set a callback to edit the return of the render function.