I have been hoping this would be added out of pure common sense, but it has not, so here is my suggestion.Minecraft version 1.5 (correct me if I am wrong) added whetted pressure plates. These pressure plates look like a portion of a gold/iron block. I personally think that in a build made completely of quartz, glass, and gold, that a gold pressure plate for a TP-Sign looks much, much better than a wooden or stone one. I have been forced to use wooden buttons, to keep them as small as possible, but it just does not fit the build. I think it would be very easy, and much appreciated to add iron/golden weighted pressure plates as a method of TP-Sign activation.Thanks for reading.