hi i've the same problem here!!
I dont want members to select mid categories. Ive closed main categories to select in dashboard. But subcategories which are also parent categories still can be select. For example:
Estate = main category
To Hire = sub category
Flat = last category
Now the member can select "To Hire" as a category which i dont want it. I want them to select just "Flat"(or any last categories).
How can i solve this problem? By the way im using bender theme and 3.7.1