Intresting fix intiated by the company; to have the STC placarded on a plate next to the shaft, and a list of what to look to, etc. Certainly can see the smart side of it to draw the attention of the pilot to the incorporation of a particular mod, but does it open a pandoras box? What about placards of ADs? What about placards of pre flight requirements, and inspection criteria? Or should these things remain in the FM?