I am trying to generate a "newbie" world for myself, ideally I would like a site with flux, lots of sedimentary layers, forest and sand on top, with a brook and magma. Other features such as chasm, cave, HFS etc are optional, but I would like to be able to start and play with every industry and have most types of ores available - so for example ideally I would have at least one tile of granite so I can have bismunthite and cassiterite, one of marble for flux and sphalerite, and gabbro for nickel, with the assumption that most of the other ores can be found in these layers. So that's sedimentary, metamorphic, and igneous intrusive layers in one site. Is this even possible? Is there any way to nudge the world-gen towards the particular types of stone I want, and are there any third party tools superior to the built-in finder for locating a site?
Secondly, while I don't want to completely eliminate danger, I also don't want to embark on a terrifying map where all my dwarves will be eaten by zombies in the first minute. So I'm trying to tweak the parameters so that benign/savage are minimal and neutral is frequent, the same for good/neutral/evil. But, I'm worried that if I have no evil/savage permitted then volcanoes and chasms can't form because Fire Imps and Cave Spiders seem like they would belong in those categories. Can anyone confirm whether savage/evil tiles are necessary for volcanoes and chasms to form?
Any additional advice in genning this world is appreciated. I am using Mike Mayday's package installation for 40d18, and other parameter sets have produced slightly different worlds for me when run - for example running the dwarf heaven seed produced the same general site but the layers were different and there was no flux. Thanks!