If you need different SSH parameters for different hosts, you can do so by using a feature of the PuTTY suite called sessions.
Download the PuTTY suite from the PuTTY site.
Run putty.exe and enter the required parameters, then
enter an appropriate session name below the Saved
Sessions label, and click Save.
In the TortoiseCVS Checkout Dialog, enter the session name instead of the host name.