-- dialog or prompts for choosing character.
popup_dialog -- port should pop up dialog boxes for input.
preload_tiles -- port should preload tiles into memory.
-saveselection -- if port can display a menu of the user's saved games do so.
scroll_amount -- scroll this amount when scroll_margin is reached.
scroll_margin -- port should scroll the display when the hero or cursor
is this number of cells away from the edge of the window.
+selectsaved -- if port can display a menu of the user's saved games do so.
softkeyboard -- handhelds should display an on-screen keyboard if possible.
splash_screen -- port should/should not display an opening splashscreen.
tiled_map -- port should display a tiled map if it can.