I thought the "Sym" button on the QWERTY keyboard would allow you to enter symbols on the remote, but when I use that in Tivo Search, it turns the top rows into numbers 1-0, and the rest of the alphabets don't do anything if I click "Sym" button 1st. I was trying to look for "$..! My Dad Says". I can still find it using "Dad Says", just thought it's odd that Tivo won't allow search by symbols.
I also tried it in Wishlist, editing wishlist names, and in that menu the "Sym" key does not do anything. So I guess I can't use any symbols in wishlist names.
In the sign-in screen for Youtube however it works to enter an email address as my account name.