As per our discussion on Discord, I wouldn't mind having some sort of air cargo capability in the game, but I lean toward the primitive. Something down-to-earth (now there's a contradiction ).
In general, I love the game from a survival point of view, as you know, and I'm not opposed to having a bit of technology available. But I'd hate to see the game get too far ahead of itself. Although I use it myself, the ore detector already seems a bit out of place to me. I would have preferred to have something on the order of divining rods, or maybe even a compass-like device, either of which targeted ores depending on what materials were used to craft it.
Divining rods, for example, are already in the fact-vs-fiction category in real life, but after what I saw with my own eyes, I'm not as much of a doubter as I once was. True story: when my parents retired to a 42-acre piece of raw land in the California foothills, my dad desperately wanted a better year-around water supply than was currently available. After paying thousands of dollars and drilling several extremely deep holes, the well company he hired came up empty. As a last resort he brought in a local legend who used divining rods (2 L-shaped bent welding rods) to see what he could do. The man only charged a couple hundred dollars if and only if he found water. The old guy wandered the property for hours without any luck. Even he ignored the slight indications he got when the rods pointed too far uphill. When he finally gave in and let the rods do the talking, you guessed it, at the top of a hill, almost the highest point on the property, he grabbed his pickaxe and started digging where the rods had led him. Within minutes he had water flowing out of the ground. That well supplied generous amounts of water from that day on.
So my vote for technology in general would be to stay as basic as possible and still provide "advanced" conveniences, such as rail transport and primitive vehicles, and maybe even a rudimentary electrical system. Say, like a water-wheel or wind-powered powered generator to drive simple motor machines, like grinders, water pumps, refrigerators, and so on. If we start allowing too much technology, the possibilities would become endless, and even Red51 would have trouble keeping up.
My 2 cents.