I'll focus this thread on chat UI suggestions:
1: Should be able to change all colors of all text. I realize many of them can be found in the [Options -> UI] but not all of them - for instance, DM. I really enjoy having a separate window for the DM text so I can see important quest text (or to me, important to theme).
2: When you create a new chat window, it should inherit the properties of its parent. By that I mean whatever it's parent's input and output parameters were.
3: When you go into the options to set what text appears in this window (DM, Say, Guild, Tell, General, etc) there's a huge drop down list. When you click one of them off or on the window then closes. Therefore, if you want to create a window that is just for Loot rolls you have to: [right click, output options, select on/off one from drop down list] N-1 times (where N is the number of things in that list, which feels like about 20-30). This is unbelievably tedious. Probably the best move here would be simply a "uncheck all" and "check all" list item.
4: More than 1 font in several different sizes, please.
5: Similar to #1 (foreground color of each text type) we also need a background color which, in particular, allows transparency.
I believe these features would improve overall player experience and help retain new players. I realize something like this will not attract new players but I believe will help with retention.
If others can tell me how these features already exist in game and I have overlooked them then I would appreciate it. I'll of course counter with the fact that since I can't find them (should they exist) then the suggestion would be to improve their placement and visibility.
Thanks for taking the time to consider my suggestions.