X-Forwarded-For (XFF) is stored in the checkuser table. For Wikimedia wikis, on average how often does the XFF value match the IP address value?
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I don't understand how that question is important... it is most likely people using the header in an attempt to bypass IP access restrictions.
Also XFF can contain multiple values (separated by a comma)
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I just sent an email on this, which might answer your question. In brief, we'd like to know how useful XFF would be for creating the blocking fingerprint, or if we should just proceed with allowing CheckUsers to block by UA.
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Our team won't do this — if someone else wants this, please drop Anti-Harassment and find a new owner.