Regardless of rel="nofollow" the current whitelist and blacklist features which are used across languages anyway will still be needed.
Therefore, could I put in a request for a "greenlist" feature to allow sysop approved links to be generated without rel="nofollow"?
If it is hard to do directly (and I cannot see an easy way), an acceptable alternative is the creation of http://greenlist.wikipedia.org under interwiki which autodiverts:
http://greenlist.wikipedia.org /first-string/second-string to http:///first-string/second-string for any /first-string/ on a greenlist.
It seems to me inevitable that this feature will be wanted sooner or later on en, and will be useful for other implementations so doing it sooner rather than later is preferable...