I am no expert in magicdata, but I think this is not direct editable.
The #1-team allways uses the first pit. If you really want to change that, rename the ferrari-files to prost-files (only .GP4-files, not the .tex-files!) in cars.wad to exchange the order. After that you have to change the order in the performance data upsite down as well
. In consequence I recommend to make the pitbuilding neutral referring to team colours if you plan to release the track later.
Teammatecars not pitting at the same time should be part of the GP4.exe. I think this is not changable. But I never had problems with that, except with lapped cars and unscheduled pitstops
.
Hope that helps.