Is what Darklol did under safety car allowed. The Sporting regulations for Formula 1 have this in the Safety Car section,
"Drivers must not drive unnecessarily slowly, erratically or in a manner that could be deemed potentially dangerous to other competitors. Drivers may not pit, unless it is to change tyres. They are also not permitted to overtake, except if another driver in front enters the pit lane or slows with an obvious problem."
Darklol drove EXTREMELY slowly on the straight in order to allow his teammate to have a guranteed lead coming out of the pit lane. As AtomicTurtle said when he was driving right behind him, that they both must have had a positive delta of over 2 or 3 seconds on the straight. That is definetly unnecessarily slowly.
The reason why he did that is we were going to try and double stack in the pits but then he decided better against it as he wanted to go and try and put on the Mediums so he would not have to pit again.
The game will actually give you a penalty if you are going too slow behind the safety car for too long and tell you to speed up and catch the safety car. I had to serve a 5 second stop and go penalty added to my pit stop because I was giving too much room to Dark on the 2nd safety car lap.
As far as PRL goes, I do not believe that there is any rule for that, but you can send it to the stewards if you want. In the end it would not have effected anything because I would of had enough gap to come out first anyway. Its not like real life F1 how they can really mess up the pit stop, I have only seen variations from 1.9 to 3.2 seconds and I should of had at least everyone covered by that as Dark was out of my DRS range for P2 and then however far you guys were back.