Heyo. Since there aren't any save editors for this game, I thought I'd make at least what I can for it.
With a bit of help from Oishikatta (Thread Here, just leeching the information in the thread) and some tedious testing, I threw together a small program to edit the village.

REQUIREMENTS:
Ability to extract and insert your save (savedatafiler for example)
CIA/3DS version of the game (See here for how to use 3DS/Z) or some way to re-import the save to a retail cart
What region does it support?

USA/EUR/JP
A thanks to liomajor for info on the JP/EUR versions of the game.

What can it edit?

1. Village Building Level
2. Village Population

What can it "maybe" edit, if someone gets around to it?

1. Time left on building construction

What can it NOT edit?

1. Anything else in the game that isn't in the village.

"What about Nemesis(s?) or insert thing I want to edit here!"

If you can figure out how the save format works for that, feel free to fill me in, or throw together some code yourself.

ALWAYS MAKE A BACKUP OF YOUR SAVE JUST IN CASE!

Steps to use:

1. Extract save to PC
2. Open COLONY#.sav with the program (# can be 0, 1, or 2. Program won't let you open other files)
3. Change values in text boxes / dropdown menus
4. Save, send through savedatafiler, then play game

Note: Editing the game outside the values this program allows will almost certainly crash/freeze your game, so while you CAN edit the source code to allow you, you really shouldn't.
Source is available : Here (It isn't anything amazing, but hey, it works)
Download is available : Here

 

Great job, been waiting for something like this.

 

PG (Money) GAME0.sav (decrypted) Offset BEEB

 

Would you be open to web browser injection (like the Pokemon community is using, it's open source) for this type of thing later on? Nice work!

 

As far i've tested without this tool, it works for JP and EUR Version - same offsets

 

I've interchanged savegames from EUR/JP before you released your tool to add villagers.

 

awww I hoped so hard for nemeses editing... oh well. thanks anyway.

 

yaaay it would be so cool.
after that, I'll have to look around how to extract saves from retail carts and putting them back in without corrupting them >_>

 

Interesting. I wonder if there is an unlock flag in the save as well that would fix that, or if that is stored in main save.
Also, the various sword are the different buildings the village can have.

 

Oshikatta mentions playing around with JP amounts--does anyone know if you give JP to a locked class, can you use it?

I'd love to have an all-class unlock feature from this save editor at some point. I'd love to experiment with all the classes earlier on than waiting for them to unlock normally.