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Area transitions should highlighted permanently
As most people have pointed out, it can be incredibly difficult to enter some houses. New players may play all the way through BG:EE without ever knowing you can enter many places. Remember in Neverwinter Nights when you enabled the debugmode, and all area transitions & triggers were highlighted yellow? A similar effect could be used for the iPad version, giving you an actual coloured area to tap to enter/exit a map/building.
Also I believe the highlight/hint button should be a toggle switch, OR the maximum setting for 'feedback' in the gameplay options should always highlight doors and interactable containers.