This mod removes all DRS zones for every circuit in all sessions (be aware, YDT does count, too)
Your engineer still thinks there is DRS available, so he will tell you in dry races that you can use it.
It is possible to fix this and I certainly did it for F1 2014 for myself, but as I have deinstalled the game, I also have removed all created modifications
The No DRS mod has been created on request (as the files were a bit different from 2013 and have more circuits).
Feel free to include the files into your mod and have fun racing more the purist way.