I just thought two simple changes that might help some people.
1)I can't get why we have to take off our armor in order to open a shop. It's actually annoying and also immediately uses 2 slots of our inventory. Biggest problem of this, sometimes I full my shop with stuff and I forgot to take off my armor and then I have to make the whole shop again from the very beginning...
2)It is really good the fact that we can share our items via call chat for free so the others can see them when we want to sell/trade etc. But sometimes, I don't know why, maybe because of the lag sometimes or the many messages in the call chat, when I click on an item so I can see it, it doesn't work or it shows another item from another player or sometimes the click works as a move command for my character and not to open the actual item. It is annoying, not sure if I'm the only one that having this problem but I suggest if it's possible to make it pop-up when we just moving our cursor on it and not by clicking it.