With new farming system coming, both berry types should become stackable(to 5) and growable(harder to grow and requires a lot of effort) but will reward players who put in the effort, as right now they are effectively useless as an item.
Yeah farming now is a joke
That would be so overpowered tho. You can heal yourself to the max within 5 seconds. Just use medkit and spam-eat/spam-use berries and stims
If there are berry farms they should be similar to mushrooms, 10 hp instantly is broken