You really don’t need a mod for this, though. I’m not sure a mod even could, but it’s even simpler than that.
[Incoming copy-paste:]
There’s a very easy way to do this if you’re willing to poke around in your user_settings.json. [This is in your Stonehearth folder; for me it’s in C:\Program Files (x86)\Steam\SteamApps\Common\Stonehearth.] It’s really just a plaintext file, so even Notepad would work.
So after the last option you have, you’ll want to add a comma, press enter, and type "infinite_inventory" : true.