All the calculations are made with grams. Why not.
But all the fundamental constants are different because of that!
We can't make a simple calculation in kg, we have to convert each constant into kg, otherwise all the calculations are false ( I know, I experienced that !).
For example, if I make a calculation with the planck constant, I have to convert all other terms into gram because of the 10^-3 factor....and for some expressions it can be very hard !
It very dangerous because if we don't notice all the calculations are false.
If there is no improvement, I can't use this software anymore.