vldPersonals is designed so that features can be added through the use of extensions.
Within your templates you'll typically include an extension like this.
{randomize:min=1,max=4}
In the above example, a random number from between 1 and 4 will be generated and displayed.
Here are some more examples.
{new_members:}
With the above, a list of new members will be displayed. Since no parameters are passed, we put the closing bracket right after the column and extension will use its default parameters.
{new_members:limit=4,pictures=1}
In this we're passing 2 parameters to our extension telling it to display only 4 members with pictures.