madmans gp4 tweaker can alter pit stop timing.
ianwollem there are three hapes associated with cockpit, cockpit.gp4, cockpit_wheel,cockpit_dash, the cockpit shape is acombination of the other two, you can delete this shape as it is not used by gp4. the dash is editable by default but the wheel isnt. either import the wheel from the dash or use the one already created by someone else as a base (momo wheel somewhere, search this forum)
i guess you coul try merging the dash components into the wheel and see what happens.
the performance file seems way too slow for me, i did a race at monaco and i was 3 seconds faster than everyone else, i was running 1.23 and every one els 1.26, im not that good. i used the benneton physics file.