Hint: Pre-alpha means that it is very early in its development. AKA, its very, very far from finished.

HUUUUURRRR DUUUUURRRR
I know this you twat :V

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Yea, I'm gonna toss a difficulty setting, expect more horrible placeholder sprites.
Easy:
AIs don't consider you a threat, they have a weaker economy, making attack forces smaller.
Your mines collect more gold, your elite units are well trained in first aid, so they heal rapidly.
Medium:
Everything is the same
Hard:
AIs are ruthless and completely ignore each other, and seek only to smite you, then each other. They have a massive war economy resulting in absurdly massive attack forces.
Your mines have difficulty finding gold, and your "elite" are poorly trained, so they heal slowly.

Any other variables that are easy to change that you guys can think of?

After tinkering a bit, I created a version that doesn't give errors for me:

Which files have been edited?

That can be fixed.
Give me a list.

There were a bunch of places in UnmappedLands.rte/Weapons/DummyAPRL.ini that attempted to give an infinite lifetime to the things it was making, which didn't work but was left there anyways, and I just changed them to very high numbers instead, hoping whatever it was would never need to stay on the screen indefinitely. If it did, you could make a Lua script that changes the lifetime back to said large number periodically as an alternative.

Missiles last for only a few seconds, so that shouldn't be a problem.
MaximDude:
Some sprites for easy medium and hard, like the banner. The difficulty is shown below, and the banners are:
A crab on a greenish background for easy, a coalition on a yellowish background for medium, and a brain robot on a red background for hard.

Anyway, I've received a Dummy Last Stand mission, so expect an update(with the lifetime edits).

Some awesome progress here! I can update OP with new releases\participants if you guys want.

UPD:

Mail2345: Mission debugging will be much easier if you put them on the campaign map. You can remove trailing zeros for scene's Y to put them back, and set attack05's X to 0 to avoid overlapping with Attack03. I guess it would be OK to put missions on strategy screen while development in progress, jyst tell people to avoid clickng on these.

Just rip the badges for the difficulty sprites.

EDIT: like these?


Easy

Medium

Hard

EDIT2: ♥♥♥♥, brokketed the links. One sec.
EDIT3: There, fixed the links and tweaked some borders. Comments?

They don't fit in well with the load screen. Though I just realised that maybe text would be enough.
Anyway, I've hit a major problem:
viewtopic.php?f=1&t=19274

It's like the scene code is possessed or some ♥♥♥♥.

I have a mind to make some custom modules and donate them to this project.

Okay, problem solved. Whew.
EDIT:
Okay, fixed a MP3 dependency, and a elite bug.

Updated the OP to reflect recent progress.

Not Mac version friendly. There are a few instances of this, but setting them to a few digits of nines fixes it.