Hi,
The Community Tech team are working on global preferences, to make it possible to set preferences for all Wikimedia wikis instead of for each one individually (which you’ll still be able to do – global preferences will be optional). We're now investigating how important it is to override global preferences locally, which would mean you set a preference for almost all wikis but still have different settings on one or a few wikis. Maybe because you’re more active on one wiki, maybe because you edit in different ways there. The reason we're asking is that this is technically complicated. We're now looking for feedback: https://meta.wikimedia.org/wiki/Talk:Community_Tech/Global_preferences
We've had this in Tech News, on wikimedia-l, posted on some Village Pumps* (dependent on languages I and a couple of folks I pinged speak well enough, really – English, German, French, Dutch, Swedish, Italian). If you think folks in your local wiki community might have missed this and would like to have opinions, please spread the word there and ask them to comment on Meta (in English or, if they're not comfortable doing so, in a language they speak better).
One of my English posts is here, if you'd like a template: https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#Global_pref...
Things you might want to stress: a +1 is good, it shows more people need this; global preferences are optional, so even without exceptions you won't have to have the same settings on all wikis, it's far better if they reply on Meta than locally, as we can only take it into account if we see it.
* Or equivalents thereof
//Johan Jönsson --
wikitech-ambassadors@lists.wikimedia.org