Menus
Besides the Descent look of its menus, D2X-XL now has two menu styles of its own, a blue and a red one, each with its own wallpaper. Text and title colors, progress bars and the boxes behind the menus follow the style. The style is chosen in the miscellaneous options and stored in your profile.
The screen resolution menu has been rebuilt: you pick an aspect ratio, get the resolutions of that ratio to choose from, and there is a checkbox for fullscreen.
Typing a letter in a menu takes you to the next entry with that hotkey or, if there is none, to the next entry starting with that letter. The options menus have an entry that sets everything in them back to default values.
Briefings show a spinning 3D model of a robot when the movie they would play for it is missing.