Well you can disable specific monsters since version 8.24
[I][INDENT]Based on feedback from the poll about switching from Peaceful to Normal, this patch adds some options to adjust difficulty. There are some presets and also an advanced options window to adjust each option individually.
There are two options for adjusting how ore veins are generated.
Metal Depth - Picking "Shallow" will generate higher tiers of metal at depths closer to the surface, while "Deep" means you will have to dig deeper before finding the next tier of metal.
Metal Amount - "Scarce" generates less total ore veins, while "Abundant" generates more.
The next three options adjust how enemies spawn.
Enemy Strength - This scales the calculated strength which is based off Kingdom Worth or depth. A strength higher than 1 means, stronger enemies will spawn for the same Kingdom Worth or depth than normal and a number less than 1 means weaker enemies will spawn.
Attack Rate - This scales how often enemies spawn. A higher number will spawn enemies sooner while a lower number gives more time between attacks.
Attack Size - This scales the number of enemies that spawn.
The next option additionally increases enemy strength over time. This combines with the strength calculated from Kingdom Worth or depth.
The next few options for difficulty allow turning different enemy types on or off. You can turn off all underground enemies, or just mants or whatever here.
This patch also adds some sliders for adjusting terrain generation. For the next few examples, every world was generated on a Standard size Kingdom with a seed of 0. The pictures are also zoomed out further than normal with all hidden cells visible to give a better idea of the changes.[/INDENT][/I]
Looking at the Options, right now, there are wild animals, goblins, mants, golems, zombies, skeletons, beetles, spiders... and you can easily select which you want to deal with and which you don't. Top side only would be Wild animals and goblins... and mants. Anyway, the advances options are really nice and were not present for anyone who tried it early on but not since a lot of updates.