After some thiking on it :
if it's possible to make a button contextual (like when you choose the material of an object). A second button exclusive with the first (maybe with the green check icon).
Another way but it a lot of work add a tab (like the restrictions one) with for each colonit / animal "No position", "Position1", 2, 3, 4, zone1, z2, z3, ...
On click on position cursor is used to select it.
if it's possible to make a button contextual (like when you choose the material of an object). A second button exclusive with the first (maybe with the green check icon).
Another way but it a lot of work add a tab (like the restrictions one) with for each colonit / animal "No position", "Position1", 2, 3, 4, zone1, z2, z3, ...
On click on position cursor is used to select it.