populating a Post Custom Field

This plugin is great, it’s helping me a lot. There’s one limitation I’ve found so far. It’s easy enough to populate a drop-down with posts from a post type, and I can get the right post types in there with filters. However, when I select a Post Custom Field, and set the field type to drop-down, I don’t get the same Advanced options as with a normal Drop-down field.

https://ww.wp.xz.cn/plugins/gravity-forms-custom-post-types/