Simutrans development has not real end; but I would like what you, the user think of this game.
In the moment simutrans allows you to built your world, like a virtual railway. If you do just the virtual rialway stuff, then of course graphcis is the most urgent improment area ...
You can also play against the masses appearing at the stations or against the AI. In both cases you will fast earn more money than you can spend. So you are lacking the challenge. A better AI, network play, or campains are needed.
You can also sit and watch the world evolve with the AI and just help it here and there. A scriptable AI may your most urgent need.
However, I would like to know about the improvements your the player want most. If you do not see them in this poll, write them down.
PLEASE: Not details stuff. Fill an extension request for those.