It does! There are several sort of 'catch-alls' in place:
1) stuff in /etc that doesn't belong to any obvious package, ends up in an 'etc_custom' role
2) stuff in /usr/local ends up in a 'usr_local_custom' role
3) Anything you include with --include will end up in a special 'extra_paths' role.
Here's a demo (which is good, helped me spot a small bug, the role is included twice in the playbook :) I'll get that fixed!) https://asciinema.org/a/765385
1) stuff in /etc that doesn't belong to any obvious package, ends up in an 'etc_custom' role
2) stuff in /usr/local ends up in a 'usr_local_custom' role
3) Anything you include with --include will end up in a special 'extra_paths' role.
Here's a demo (which is good, helped me spot a small bug, the role is included twice in the playbook :) I'll get that fixed!) https://asciinema.org/a/765385
Thanks for your interest!