As the behavior of the safe search toggle between text and image search is so different (text: allow NSFW; image: prefer NSFW, sometimes, depending on unknown external factors), I’d really like independent toggles.
I always search with safe-search off, because I do not want to be limited in results, for example I sometimes have searches for PH or X(Hamster|Video) blog posts, mostly their statistics. But as seen in the related bugs (same issue with bing already, I guess Google doesn’t have an image search API and bing is embracing their reputation as porn search engine), the toggle results in inappropriate results for the image search as less relevant NSFW results show up instead of relevant results.
Related bugs:
Image search for Zima Blue gives unrelated porn results [NSFW]
"english motherfucker" image search gives porn