I've created an addon for Roster20 called NukeSync, based off an addon by boyo called SMFsync.

Basically the addon handles member syncronization between Roster20 and a phpNuke Platinum CMS including;

-Creating CMS groups for each guild rank if desired
-Mapping Guild ranks into exsisting CMS groups
-Creating "special ranks" for players in the CMS forums based on guild rank
-Mapping siggen info automatically to the users CMS profile for avatars and signatures.
-Predefined actions in the CMS upon a user leaving the guild (suspend or deactivate nuke account. etc)
-Per-user mapping of Roster member with CMS account name
-Per-guildrank mapping of users to CMS groups
-Logging of all DB changes to the CMS
-Extensive Display options to see all roster and CMS users and the groups they belong to.
-Multiple guild support

You can take a look at some screenshots here;
NukeSYNC screenshots

I'm 90% done with all of the functionality and currently using this for my own guild, If there is interest I will complete the documentation and provide the addon for general download.

-Vlorn

I would like to have this!

dunno if this would work with reg nuke 8.1 but would like to try

Same here, running nuke 8.1 would love to give it a shot