Also, editing the game to give you Iron from the start?
Steel, not iron. There's a
huge difference in .31 compared to the way it was in 40d, and the wiki doesn't do a very good job of explaining it. data\init\world_gen.txt has all the settings for each set of worldgen parameters, and one of them is EMBARK_POINTS. By default this is around 1600 points to cover the basic equipment, but if you change this to say 8000 and then generate a new world, you can bring along a bunch of steel bars and maybe some extra food to help with the first year or so. The embark menu will let you bring along all sorts of things but the default settings dont give you enough cash to really make use of it.
It's also possible to disable sieges by editing data\init\init.txt and changing INVADERS:YES to INVADERS:NO. This does not require a regen and can be changed at will (but it will not prevent a siege that's already been "queued up" to happen later in the season...I have tested this).