We've recently updated our AppsFlyer connector in Funnel. You now have the ability to include and specify custom event values when creating a new connection.
All you need to do is enter the custom events in this field separated by commas and these events will be displayed as dimensions in Funnel.
You can learn more about the fields that are included in "Raw Data" reports and the dimensions we pull in automatically in this help article.
We hope that you find this update useful. If you have any questions please contact firstname.lastname@example.org and we'll be happy to help :)