So, I tested and tested and yes, the game does not like Button. He's never calling his name BUT that's also the issue (for me) with vanilla 2008 database.
However, my engineer told me: Massa was leading, Fernando was in the box, I was close in front of Raikkonen, Hamilton prepares for a pit stop.
Yet the values of 2013 (like Kovalainen and Barrichello) seem to not count anymore, sadly.
But as the changes work as intended, there's nothing to fix.
E: Yeah in the speech files the old drivers are no longer included. Will test if the speech file from 2013 will do more (I mean the standard sentences didn't change after all).
E2: while testing the 2013 speech file, my engineer mentioned Button, finally
but no Kovalainen