Counterstrike has in-game rcon via the game console, and TCAdmin has built in support which allows clients to run rcon commands via their control panel.
As long as you have the proper game compatibility set for the game, the panel will handle that. Users can access the rcon from their panel by logging in and clicking on their CS server and then on the System Status icon. Rcon is at the very top.
If you downloaded the config file from here, it will also include the kick and ban feature on the same page. Clients can kick and/or ban by clicking the link next to a players name in the status link.