1.) This would allow webmasters to be able to deal with redirections due to the ignorance or abuse of other webmasters.
2.) Redirection 302 would still be accepted as such by search engines when authorized by the webmaster of the target page.
3.) The tricks with a temporay "noindex, nofollow" is quite interesting, but it is obviously too tricky to be a real long term solution. The worst side of it is that it creates a lot of unproductive work for the victim.
An advantage of this NOREDIR is that it could work with all search engines. Not only Google suffers from the 302 redirection.
With the recent introduction of NOFOLLOW, the search engines proved they were able to create new attributes to make their work better. Why not a NOREDIR? It would give a competitive advantage to the search engines supporting it.