Is it possible to run standard mechanical shifting on a Scott Foil Premium frame?
The Foil Premium frame does not have the factory routing for mechanical shifting. It is designed for Shimano Di2 or Campagnolo EPS electronic shifting only.

I was able to modify the frame successfully to accept normal cable routing, but I wouldn't recommend it unless you are very confident in your skills with drill and dremel. And of course it voids the warranty.

Edit: 

To respond to a couple of requests for more information in comments, I've added some detail about this frame mod. 

To be clear, this very much voids your warranty, and requires precise and careful work to avoid destroying the frame. 

FYI, my mod was successful, but was very risky. I literally had to cut a large hole of a very specific shape and position in the BB shell.  I also had to drill a hole through the pre-molded cable stop section at the head tube, as well as through the chainstay by the rear derailleur. 

The holes needed to fit these parts and be very, very precisely placed in the frame. 

I was able to make a pattern out of paper and take very careful measurements From a Foil 10 frame. Without that ability, I would not have been confident enough to do this mod.