• Number of towns/Number of industries – The large map size looks spectacular, but the default map generation looks like it fills it with a *lot* of towns, to the point where you’re spoilt for choice rather than the large distances offering any extra challenge.  It would be great to be able to generate far fewer towns and industries, so that you really have to plan out epic routes on the large map size to connect the few you have available to you.
• Number of rivers – As rivers tend to be a natural focal point for your rail network, seeing as they mark out the flattest, low-lying routes around the map, being able to generate fewer of them would force you to spread out into the hills sooner.
• Straightness/twistiness of rivers – Alternately, maybe have similar numbers of rivers, but have an option to make them twist through steeper sided valleys rather than being mostly straight and bordered by flatland.  (Or an option to mix the two)

I don’t know how much this would require the map generation to be altered.

I presume the fewer-towns thing would be fairly straightforward… as well, surely it wouldn’t involve much more than needing to set a smaller number somewhere.  I guess the river thing could be a tad more involved, as it may be more intrinsic to the overall terrain generation.

What do people reckon?  I’d really love to have the town density option at least.