Hi Viktor,
Thanks for this tip. I looked into this option. Do you mean something like leveraging wp_link_dialog() and a usage like: https://stackoverflow.com/questions/11812929/use-wordpress-link-insert-dialog-in-metabox ?
If so: that will insert a complete url, where as we are storing a post ID.
Via this ID we later retrieve the permalink. This will ensure no internal links will become dead links even if a post slug changes.
The dialog does add a search function, which would be useful. The upcoming ‘Pro’ version of the plugin does have a settings field for selecting which posttypes to show in the dropdown, to be able to exclude certain types you don’t need.
Thanks!