locations dropdown list

Hi,
1. this is possible with the Maps and Locations extension, or if you are familiar with PHP programming you can customize the form using adverts_form_load snippet.

2. we are planning to change how the categories are displayed in [adverts_list] and [adverts_add] but in the meantime you can install the Dependant Taxonomy Dropdown snippet https://github.com/simpliko/wpadverts-snippets/tree/master/dependant-taxonomy-dropdown

It will force users to select top category first then the sub-categories will load and so on until the selected category does not have sub-categories.

How to install the snippet you can read here https://github.com/simpliko/wpadverts-snippets/ at the bottom of the page.