Ok, here are now two useful tips to use the client a little bit better:

• Tired of sorting out your inventory? Wish, there would be more windows open than only one at the same time? This is possible, but well hidden in the client. Just open the first Inventory window, go in the File menu there and select "New Window". That’s it. You can have as many windows open as you like.
• Offering teleports is broken again, you cannot give it to friends (yes, still happens sometimes to me)? Just press Ctrl+Alt+V, then you can offer it to anybody, don’t worry about the other options, they are not going to work at all.