I was facing this problem and always copied the modules instead of using relative.
Now that the matter came up, see below, (intentionally made code below to keep message small)
https://www.b4x.com/android/forum/threads/b4a-v9-90-has-been-released.119043/post-746297
https://www.b4x.com/android/forum/threads/b4a-v9-90-has-been-released.119043/post-746037
https://www.b4x.com/android/forum/threads/b4a-v9-90-has-been-released.119043/post-745642
I am making the wish now.
Actually when one is working in more than one computer then export a project from one machine and unzip in another is not so simple if relative path chosen. (B4A being Free now makes me work both at Home, Office and also at my friends house)
See if it can be implemented as suggested by members.
Regards,
Anand