By default, when a message has finished displaying all of the words and is waiting for player input, a little animated cursor is shown to indicate that the player should press the confirm button to proceed. However, this cursor is stored inside the windowskin, which gives you enough freedom to...
Galv had one too "Galv_MessageStyles", it has more, but you dont have to use all options.
alot the one above caethyril mentioned is something I dont know, but changing speed
is also nice to have (specially if it can render multiple ones like main actors, story npc's
etc and 1 for normal npc (blacsmith the hammer, alchemy a bottom of its kind)