Allowing module defined file types (like .avi) in Gallery

As I've seen a couple of threads on this forum from people asking for support for additional movie formats (like this thread), I thought I'd start a thread to document my attempts to get Gallery to accept .avi files. At this point I have managed to modify both Gallery and Gallery's server add module to allow importing of .avi video files into Gallery. The relevant changes include --

Server Add Modifications:
Edited server_add/controllers/server_add.php to include lines 51-53 and 129-131 to allow for additional file extensions. Also added lines 247-250 to allow module defined create functions.

Gallery 3 Modifications:
Created file gallery/libraries/File_Extensions.php to maintain an array of file types that can be added onto by module::event functions.
Edited gallery/helpers/MY_url.php to include lines 38-40 to allow for module-defined controllers.
Edited gallery/models/item.php to include lines 219 - 220, 226, 248 - 249, and 255 to allow modules to define an item type with a .jpg thumb when the full size is not a jpeg.
Edited gallery/helpers/graphics.php to include lines 123-126 for allowing modules to specify item types that do not have a resize and lines 137-138 plus line 142 to define additional item types that use ffmpeg for thumbnails.

Note that this has not been thoroughly tested. It's possible that there could be other areas of Gallery that would also need to be modified, that I haven't stumbled across yet. I've basically been editing files one at a time to fix whatever issue I ran into after the previous edit

An example .avi can be found in my testing gallery here. As Gallery's video player doesn't support .avi files, I've programmed the site to just display a direct link to it allowing the web browser to decide if it should be played in the browser or downloaded.

Comments? Suggestions? Any better ideas?

Edit:
For anyone following along, I've modified Gallery's simple uploader to work with additional file types as well:
Edited /modules/gallery/views/simple_uploader.html.php to include lines 53-66 and modified line 76 to allow users to select additional file extensions.
Edited /modules/gallery/controllers/simple_uploader.php to include lines 45-56 and modified line 60 to allow the simple uploader to except additional file types. Also modified lines 77-78 and added lines 82-87 to allow the simple uploader to save module defined files.
I also went back and changed the "create_new_item" event to "create_new_FILEEXTENSION" (ex: create_new_avi).

No, I was going to sign up on the mailing list, but I never seem to get around to it.

Actually... There, one of my emails should now be subscribed.

Done!

Nope, it's still a "use at your own risk" hack. The developers did say something like this might happen, but not until Gallery 3.1 at the earliest.