Concerning custom trophies, it would be awesome if there was a wildcard or if leaving an entry area blank would work. Like checking the "Facebook:" checkbox but leaving the "User value contains text:" field blank for making a trophy simply for adding your Facebook account.
Another example: I have a custom user field for users to add their account from my main site, this is then shown and linked in the post-bit. I would like to make a trophy for those who list their account, but as far as I can tell there is no way to do that.
Having a wildcard would make a lot of sense and make the custom trophies much more usable IMHO.