Update 1:
Removed please see below.
Update 2:
After some more diggin about it appears this mod will work with a site that uses multipul sub domains!
All you need to do is to in to ACP > Settings > Options > Site Name / URL / Contact Details and set "Always use Forum URL as Base Path" to no.
After that this mod should start working on a site were the forum component is using a different subdomain to the main Forum URL
e.g
Forum URL: example.com
Forum component URL : forums.example.com
as you can imagin im now quite please to have this working on my site as i had intended from the beginng
Note: I have just upgraded my forums to version 4.1.11 and wish to report this mod is working wonderfully with the new version.