Admin can set the price of addition in the Hot List via User Credits plugin.
Also he can set the amount of days, that member will be in the list. By default the value is set to 30 days. After selected period user will be removed from the list by cron.
There are two different view modes of the widget - normal and detailed. In the detailed view mode user activity info, sex and age fields will be shown.
If there are too many members in the Hot List, they will be shown one by one with the transition, specified in the widget. There are about 25 transition effects. But remember that not every transition will work properly with any amount of users.
In the widget settings Admin can set the speed of the transition to another part of the Hot List and the number of users that will be shown at once.