Let me post my opinion.
1.
140% but sometimes I use lower value (below 100%) for some tests.
2.
There a tweak called "Keyboard Binding Assignment" that allow you to change default pre-defined key. Tips: Select the key selection (right-most dropdown), but do not open the dropdown list then press a key on your keyboard. The dropdown control will automatically select to your selected key.
3.
You mean it turned on while in race mode (starting grid position)?
I have tested it many times and it turned off under race mode, and turned on in garage mode (practice and qualifying session).
In reality, doesn't matter who's
right but most important is who's
left.