When you download and install “Rank Addon” a new section will be added to the Addons tab of Listdom -> Settings and you can configure this addon.
First of all, you can define how much having “Featured Image” and “Gallery Image” will have a positive score for listings.
After that you can set Rank value for each Category, Label, Feature and tag. For example you set 100 Rank for a category when a listing adds to that category it will take that rank.
So the listings that have more Rank will show higher than other listings.
Note: please use ranks more than 1000.
Also if you have Review Addon a new section will appear in this page that allows you to define rank for each review category like this.
Another effect that Rank Addon has is showing the Default Sort option in front end that order based on listing ranks.