When creating a custom getaway mod where you are not the only racer, it is important to set the "#Tickets Quota" accordingly.
For example, if you are playing as a racer with 7 AI racers and you want the max number of tickets for each of you to be 1, set the #Tickets Quota to "8". If you want each racer to receive 2 tickets max, set the quota to "16".
I plan to update GST Editor with a few more custom pre-configured races that you may feel free to use as a base for your gst file editing needs.