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We're frequently asked for an option to either remove the close button from PuTTY's window title, or to disable it. This is usually because some server to which PuTTY is connecting requires incoming sessions to be terminated in a particular way, and can't cope with the connection being dropped. We have no intention of implementing this.
If you have the user's co-operation, the "warn before closing window" option should be sufficient to prevent them accidentally closing the window. If you don't have their co-operation, then they could just use the Task Manager when the found that PuTTY's close button wasn't working. In neither of these cases would disabling the close button help significantly.
In any case, the server has to be able to cope gracefully with the loss of a connection, since this could happen in the event of PuTTY's, or the client computer's crashing. Once this is done, there should be no need to prevent PuTTY closing.
Audit trail for this wish.