The only places with discussion I know of are 

* https://lists.openstreetmap.org/pipermail/talk-ee/
* the old forum
* wiki estonia talk page https://wiki.openstreetmap.org/wiki/Talk:WikiProject_Estonia

I think that if you feel that something is wrong and you have no questions about it you can just fix it. Or do you want to discuss an automated change? Or create some kind of a standard? If all such places are changed, then no standard is needed, people will just do by example.

Also, do you frequent rural places and are you sure that all of them operate by the same rules? There are sometimes shops which are not a part of big supermarket chains. 