Yes, a real timetable would be impossible due to the odd way ‘time’ is depicted in the game. An average route can take MONTHS to go from end to end! However, being able to set a waiting time would be a good idea. Also, anyone looking for real world layouts should get TS2015.
Another thing I would like to be able to do is set each train as a ‘high or low’ priority. By that I mean, passenger trains should not have to give way to goods, branch lines should wait for a mainline express,. etc.