Good news!
I've found a very interesting link back at gpg.org that can perhaps improve the worthyness of race skill/BHP.
So far quali is OP, starting from the back doesn't really give you a chance to move to the front quickly (unless you're OMR)
But, basicly what I saw is DRS (sort of).
Really it's just increased slipstream effects but let's call it DRS.
I'll have to test it out first, but as DRS is used in real life DTM, I am ready to perhaps give it a go even next season if it works well.
link:
http://www.grandprixgames.org/read.php?4,1005255