WordPress MU

I'd like to stop my users from being able to upload items to the weblog server - any way to do this?

Haven't tried this myself, but you could try this plugin and the set the quota to 0 or .1 I suppose.

http://wpmudevorg.wordpress.com/project/Z-Space-Upload-Quotas

Yes, but it's not going to be fun. Also depends on which levels you want to cut off.

If you open up your wp-admin/upgrade-schema.php file and page down until you hit the function populate_roles_160, you'll note following line a couple of times:

$role->add_cap('upload_files');

That's where the ability to upload is. Figure out at what level you want this access to be granted and remove those lines from where you don't want it. (ie if admins get to upload, then remove it from editor and author)

Gotta admit though that I'm not clear on how to remove this ability from blogs already created though.

Couldn't that part of the add/edit post/page form just be removed? OK, so it's hacking a core file, but that's what would make the most sense to me.

Probably still be able to upload via something like blogdesk though.

I wouldn't think so, if the function being posted to doesn't recognize it. I dunno though. I use the performancing extension.

That's why I was thinking that. I don't think the offline editors use the form. I think they pass the uploaded file directly to wordpress.

Try taking out the form. That's the easiest way to do something like that.