messages and cameras

[Sa-x]

in some level wads i have see there are some messages in parts of levels, how can i edit them i my wads?
And in some wad, for example sonic heroes wad, appears some times a camera change, how can i do it in my wad?
And is possible, when the player is upside down, put the camera "normal"?

 

[glaber]

Do you mean the camera flips with the player?

 

[Sa-x]

Do you mean the camera flips with the player?

Yes, right