The in-game messages (e.g from /csn history) seem to use the real username of the player making the purchase/sale. When people are using aliases, it can get confusing if you don't know the person. If it is not too much trouble, could you please enhance those messages to include both the user name and the alias they were using when they made the purchase?

e.g.
Curent: " Player1 bought stuff x hours ago for y dollars"
Requested: " Player1Alias (Player1) bought stuff x hours ago for y dollars"

You only need to include the alias they were using at the time. I'm not suggesting that the message change whenever the player changes his/her alias. That would be silly. Just whatever they were using at the time.

Is this possible now?

Unfortunately that's not easily possible right now as this plugin relies on ChestShop's name manager to resolve UUIDs to usernames and that only stores the actual usernames, not the display name.