Specifically you can customise the 'loading page' of the level you are about to play, however I know what you are after. Press TAB and your mission and objectives pop up
Something that has been talked about internally last week, but more pressing features ahead of this. There is a way to do what you want through a combination of an entity such as a readout on the wall, which you can USE (all through an FPI script you would need to write), which then loads and displays a full screen bitmap fades in showing your mission, then when the player moves further than 100 units from the console, the mission bitmap fades out. All can be done in EA right now with a little FPI know-how. If you ask me for the know-how, that would be for another day, but I know of at least one user out there who knows how to do it. For the rest, I will give you a clue (which wont take me as long), check out the switch entity which detects player presence and the RETURN keypress, check out the dooruse.fpi which loads and displays a bitmap on screen and fades it out, combine the two and you have the makings of a mission console
"We are the knights who say...eki eki eki fatang loopzoing, zanziga....ni"