I had an idea for some extra Milk Molar upgrades that could be good on individual characters and groups. And it would be great to have specific playstyles and character builds / classes.

Milk Molars:
Attack Strength: 100% -> 120% -> 135% -> 145% -> 150% (cost 1, 2, 3, 4)
Blocking Strength: 100% -> 120% -> 135% -> 145% -> 150% (cost 1, 2, 3, 4)
Hauling Capacity: 5 -> 7 -> 9 -> 11 -> 12 (cost 3, 4, 5, 6 and would give +20 when decked out in full ant armor + worker's comp + new mutation below)
Passive Recovery: 100% -> 120% -> 135% -> 145% -> 150% (cost 1, 2, 3, 4)
Breath Capacity: 0 -> +20s -> +40s -> +50s -> +60s (cost 1, 1, 2, 3)
Sizzle Protection: 0 -> +10s -> +20s -> +25s -> +30s (cost 1, 1, 2, 3)
Natural Damage Resist: 100% -> 120% -> 130% -> 135% -> 140% (cost 2, 3, 5)
Elemental Damage Resist: 100% -> 120% -> 130% -> 135% -> 140% (cost 2, 3, 5)

Mega Molars:
Food spoilage rate: 100% -> 80% -> 65% -> 55% -> 50% (cost 1, 1, 2, 3)
Raw Science gain: 100% -> 110% -> 120% -> 130% (cost 2, 3, 4)
BURG.L Shop prices: 100% -> 90% -> 80% (cost 3, 4)
Workstation Craftinng Speed: 100% -> 150% -> 175% -> 200% (cost 2, 3, 4, affects the jerky rack, spinning wheel, oven, etc)

 

New Mutations:

Hauler: +1, +2, +3 carry capacity
Description: Your tiny body has adapted to carry the many burdens of survival on your shoulders.
How to get: Pick up 100, 500, 2000 grass / weed stems

Lobber: +30%, +50%, +60% throw range and damage to targets from throwing items and weapons
Description: Bulging and bursting, your tiny arms propel objects towards their destination with ever increasing force.
How to get: Throw 100, 200, 500 objects at an enemy and land a successful hit.

Recycler: Gain all resources back when recycling / dismantling a building
Description: Plans are always changing, and your mind has adapted to make use of all the materials around you, regardless of origin.
How to get: Recycle 50 objects / buildings.

Resourceful Adventurer: Gives +1, +2, +3 extra resources when breaking down sap clumps, pebbles, acorns, quartzite, berries, crow feathers, grass/dry shoots, human food, mint chunks, etc etc. Anything that needs to be broken.
Description: Your resourceful ways aid you ever further in your fight to survive, having seen more of the backyard than you ever thought possible.
How to get: Travel to 3 / 6 / All biomes on the map.

Harvester of Innards: Gives +1, +2, +3 extra common resources from all bugs (excluding raw bug meat) and +20% / +40% / +50% chance of getting a rare part.
Description: Witnessing the innards of many an insect, your willingness to pry even further under their shells has rewarded your efforts.
How to get: Kill and harvest 10 kinds / 20 kinds / every kind of bug in the game (except bosses). Infected bugs count separately from their regular counterparts.

I'm gonna be a Debbi downer here. I feel like something like attack is meant to be upgraded with the smithing table. While other stuff like breathing is part of mutations. I think the team plans on having you go through different paths to get different types of upgrades, so having everything come from molars isn't part of the plan. 

This is probably true - I wouldn't mind if they didn't include any of these upgrades at all as I am loving the current options we have 

I think it's just an idea of what *could* be possible with the molars. But perhaps you're right on the +Atk and breath duration, mutations could be the thing you need for that.