My research on the [FLIER] tag, thus far.
- Dwarves do not fly. With the addition of the [FLIER] tag, they path a shorter route, which makes them look like they are leaping or falling.
- Trader dwarves, however, do fly like any other animal. This completely and utterly prevents you from trading with them. Once a dwarf flies, it loses the animal its pulling and it ends with you getting nothing.
- Dwarves must have available ground path from point A to point B. As aforementioned, they leap. Instead of walking around the hole, and down the stairs, the dwarf will hop off the edge and land on the ground. This, however, does not mean they can not fall. They do fall, and they can get hurt from it, just any falling that the dwarf initiates does not hurt them.
- Low FPS (1-2) will cause them to stop leaping. They will revert to regular pathing.
- Wounded dwarves will still use this as long as they can walk.
- Military dwarves will use z-levels for dodging. And shooting bolts.
- Flying dwarves do not cross fortifications. It completely blocks all pathing through. However, if a floor is made above the fortifications, the dwarves will path over.
- Dwarves will use shortest available route. This means they get stuck on top of buildings. It is hard to explain, but basically if you making (b)-(C) walls, a dwarf will leap over them to get where they are going. BUT! Sometimes they will take to long to get down and this will cause them to get lost. They can not path off the top of the roof because there are no walkways.
- [FLIER] can be added and removed on will without having to regenerating the world.
Points, boiled down:
1) DWARVES MUST HAVE STANDARD WALKING PATH. [FLIER] only makes the path shorter.
2) Traders get screwed up.
3) [FLIER] military dwarves are ridiculous.
If any questions or comments, please feel free to post. I will add more information as I get it.
I will answer any questions you have about the tag. I may have forgotten to say all that needs to be said, so don't be shy!