Dear Urist McWingedTraders--
I can understand you guys entering our map while flying; it's not everyday a race of dwarves have wings and flight. I understand you'd want to enjoy your freedom. But really, what gives you the good idea of dragging your pack animals beind you, several z-levels in the air? What makes you think "Oh, we've neared the fort! Better drop my mule here and remember where I parked."
You guys store ALL THE GOODS on those pack animals! Dropping them several z-levels and leaving them there while you carry on to the trade depot is counter-productive to trade, which is your sole reason to exist! No, we will not give you a bunch of junk for nothing, we need that stuff we ordered last year! In fact, where's the stuff we ordered and desperately needed? Oh right, you dropped it with your mules back by the map edge.
You guys can go drop some mules off a cliff instead of coming down here next year. Makes no difference to us. Also, what's with the liaisons you bring? They're all a bunch of nuts who hover in midair for 6 months before finally meeting the mayor. Bunch a' wackos.
We won't trade with you if you don't bring us some goods. We'd rather just take the elves' junk, at least they have mithril.
Sincerely, The Eldritch Sentience Which Laughs at the Irony of Winged Dwarves, better known as your overseer.
An unexpected result of my modded flying dwarves was the screwed up dwarf merchant AI/interaction. Dwarf liaisons were really slowing down meetings, some taking so long the next caravan had arrived before the meeting even finished. Dorf merchants were literally entering the map with their animals trailing behind them in midair. The animals then realize they have no purpose floating in the air and drop like a sack of valuable goods and are ditched by the merchants. no goods=no trade=no good sized migrant waves. the fort was growing so slowly I finally ditched it and moved on to the next fort with grounded dorfs. I may still have the save, but I don't think it'd be worth playing.