If I understand correctly you want to limit the type of widgets differently for each section? But you can only limit it per area..
![kentico sample EditableAreas](https://docs.kentico.com/k12/files/76851879/76859403/2/1525436165945/EditableAreas.png)
The problem with that is that there is also logic from within Kentico. You can change a section-type. Say you change section 2 to Section 1 (meaning lose 1 zone) from the image above. Kentico automatically moves widgets to the next available zone.
Also the "allowed widgets" is to be used as a guide and not a limitation. If the widget was placed it won't be removed when you change the allowed widgets param.