So right now colonies are really dumbed down and inaccurate.
What Lukasz should add is:
Have actual colony countries (like in EU4 where after a while of colonising you get to form one big vassal that can colonise and is less autonomous than a regular vassal).
Have said colonial countries declare independence after a while (Have the liberty desire tick slowly up, and as you enter the 1700s and 1800s have the liberty desire tick up more faster).
Let that liberty desire rate vary from continent and historical period (like having Africa not really want independence till the 1960s)
I think this list is pretty good, you would say?