1 – Recently I saw that people are having a habit of putting salt in wine, mixing salt in the wine, in which case putting the salt in a wine cup makes it passul?
2 – If allowed, does adding salt to wine change Brachar? or does not do any Brachot?
I haven’t heard or seen anything about this topic, not that it is good nor that that it has an problem. Therefore I would say that you can do whatever you like.