Just to beat a dead issue even further...
One must also look to see how far the glide slope "feather" goes out. There are many approaches where this "feather" can extend nearly 20 miles from the runway. The majority, however, extend only 4-6 miles from the runway.
Look at the ILS 22R into ORD
http://204.108.4.16/d-tpp/0704/00166I22R.PDF
Here, the "feather" extends to FNUCH. If you were to intercept the glide slope at FNUCH at 7000ft, this would be the beginning of the Final Approach Segment. (FAF if you will)
Now, look at the ILS 27L ORD
http://204.108.4.16/d-tpp/0704/00166IL27L.PDF
In this case, the "feather" extends only to WILLT. Intercepting the glide slope outside of WILLT does NOT constitute the beginning of the Final Approach Segment. (FAF again)
To put it all together, if the weather drops below on the 22R approach while you are outside of RIDGE, you may continue. On the 27L approach, the weather must be at or above your specified vis mins for that approach when you cross WILLT.
Hope this helps.
-ST