Fixed a few tracks with DRS zones. During practice and qualify DRS can be deployed everywhere. But FIA 2013 regulations state that they can only be activated in de regular DRS zones. https://www.bbc.com/sport/formula1/20351041 AI is just using DRS at any straight line at the moment. In the race it works fine and the zones get activated after 3 laps.
You should be able to configure it correctly, I can't remember the details right now but you can make either way possible. If I remember correctly the first season (or two?) of DRS in F1 they were able to deploy anywhere they wanted in practice and qualifying, then they limited them to the same zones as in the race. And if I also remember that correctly we did the same thing in our league in rF2, but I probably wouldn't trust my memory on that one.
Did some more googling, finally end up at some PDF doc with this. RearFlapWetTreshold=X RearFlapZoneSessions=Y X= Maximum Track Wetness allowed for rear Flaps to be used (in any Session) Y= Allowed Session (add the Numbers: 1=Test, 2=Practice, 4=Qualy, 8= Warmup, 16=Race) For X normally is used the Value 0.5 For Y you can define in which Sessions the DRS will be allowed, by adding the Numbers of the Sessions. If you e.g. want to allow it in all Session, add all Numbers. The Result is 31. So you use: RearFlapZoneSessions=31 If you want to allow it only in Qualy and Race, add 4+16. The Result is 20.