Hi @marinid welcome to the community 
Freetrade DO NOT take any spread commission. They succeed when investors succeed, they want to earn your monthly subscription by being on your side - this has been the vision from the founders from the start.
I don’t know if I understand your concern with the decimal places, I screen grabbed this from the app
There is no need to use 4 decimal places on stock that trade above penny stock realm as it makes the app look untidy.