The pit confirmation voiceover is turned off in P&G yes, but if the pit light is on your crew is ready, requesting pit stop while the light is on will cancel the request as you described.
In the XD-Tool you can cycle to the 2nd page for pit options with a dedicated key (usually the one below Esc, whatever that is depending on your keyboard layout
![](http://www.festbierbude.de/components/com_fireboard/template/default/images/germani/emoticons/cheerful.png)
). As that key is dangerously close to accidentally pressing Esc I'd open the XD.ini in your GTR 2 install folder and look for the keybind and change it to some other free key by putting in the number for that key instead.
I for example have a US keyboard layout so I bound it to above the Enter key, far away from Esc.
On that 2nd page you navigate with the arrow keys down/up and left/right to decrease/increase/turn off things