I just realized I don't have to keep looking at everyone's "I am not a moderator, don't send me personal info blah blah blah" at the end of every post, by going into Settings - Preferences and unchecking that option.
I think that at least should be the default on the mobile view of the forums, and I'd say those signatures aren't necessary anyways. I think a warning in the private message entry page saying 'Dont send personal info to anyone except for the moderators (list their @ names)' would replace all the random signatures with a similar message.