It is fairly well known at this point that TF2 has Logitech G15 LCD support. When it was discovered people rejoiced!
Then they found out it didn’t work. Apparently the source engine has G15 support, and they didn’t ship all the pieces with TF2.
But you can rejoice, for the secret of getting TF2 to work with a G15 (and, as a result, G13 and G19) has been discovered!