first of all, I'm a new player so some of these suggestions have probably been made already but I want to collect my concerns or ideas for improvement about the interface. This is all stuff I noticed on my first day of playing. Roughly in order of importance (to me).
Stacks of items need to be separable. I feel this is currently the biggest flaw concerning this area (yea I know its a little more than an interface issue)
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Scroll wheel support in crafting windows
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After crafting an item the window should remember the last tools and materials being used as long as they are still available and the user doesnt select a different recipe or closes the window.
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Selecting a recipe in the crafting window should not cancel other actions like gathering.
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Targeting items/players while moving does not work. In fact, there is more that does not work unless you stop moving for a second.
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Managing crafting recipes is very tedious. Hard to overview what I am able to craft. Adding groups/categories for items in the crafting window would be nice.
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Should be able to add friends by name without physically targeting them.
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After removing a bag/basket from my backpack slot I am unable to equip anything to this slot unless I put a bag/basket on the ground and pick it up again in which case it automatically goes to my backpack slot.
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Names of players in the world are hardly readable (intended?)
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Chat colors (mentioned already, I know, just for completeness)
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Bottom right corner of the screen cannot be used by interface windows like backpack (intended?)