You can actually do that but it would be an annoying process if you plan on making a new folder for every new mesh pack in your my_objects folder.
1. Make a new folder in my_objects and remember the name of it.
2. Go to the main Feralheart folder and find the resources.cfg file. Open it with Notepad.
3. You will see this:
[General]
FileSystem=media/textures
FileSystem=media/materials
FileSystem=media/models
FileSystem=media/overlays/overlay1
FileSystem=media/overlays/overlay2
FileSystem=media/particles
FileSystem=media/sounds
FileSystem=my_presets/preset_1
FileSystem=my_presets/preset_2
FileSystem=my_presets/preset_3
FileSystem=my_presets/preset_4
FileSystem=my_presets/preset_5
FileSystem=my_presets/preset_6
FileSystem=my_presets/preset_7
FileSystem=my_presets/preset_8
FileSystem=my_presets/preset_9
FileSystem=my_presets/preset_10
FileSystem=my_presets/preset_11
FileSystem=my_presets/preset_12
FileSystem=media/objects/shapes
FileSystem=media/objects/trees
FileSystem=media/objects/shrubs
FileSystem=media/objects/grass
FileSystem=media/objects/rocks
FileSystem=media/objects/structures
FileSystem=media/objects/misc
FileSystem=media/objects/my_objects
[Objects]
FileSystem=media/objects
[Terrains]
FileSystem=media/terrains
FileSystem=media/terrains/fhmaps
[UnofficialTerrains]
FileSystem=media/terrains
FileSystem=exports
[Terrains/default]
FileSystem=media/terrains/default
[TerrainTextures]
FileSystem=media/terrains/textures
[Sky]
FileSystem=media/sky
[Presets]
FileSystem=presets
[Items]
FileSystem=media/items
Copy and paste the FileSystem=media/objects/my_objects part as a new line. Add another / to it and add the name of your folder.
Example:
FileSystem=media/objects/misc
FileSystem=media/objects/my_objects
FileSystem=media/objects/my_objects/newmeshes
[Objects]
Then when you're done go File>> Save, not Save as
FileSystem=media/objects