Bulletin Board feedback and suggestions

[eloquentmess]

This is already somewhat implemented in the navigation menu (F2). When you're in F2 and you hit F5 or F6 or F7, it switches to different sub-menus. If we could do something similar with the other menus, such as using F5 and F6 to select the tab to the left or right of the current tab (respectively), then we could make it easier to play the game without needing a mouse.

Of course, there's still the problem with the navigation menu (F4 in space), since we don't have keys assigned to the various ports at which we can dock.