Please add right mouse click to close any screen and return to the star map. This has become an established convention in other games and greatly reduces the tedium of having to move the mouse to click on an X, which just isn't fun, and games are supposed to be fun.
Please make ships always rendered the same size in the fleet screen. Its confusing when they are rendered at different sizes when there is another ship type that is larger. This leads to confusion and mistakes, and thus requires you to mouse over ships to verify their size, which again just isnt fun. Things should be consistent so you can verify with quick visual reference and train your brain. When things can vary, its confusing and you dont trust what you see, thus requiring the mouse over. When you dont trust things (such as your own brain to correctly identify the ship size) and/or get confused, it detracts from the fun of the game.