The 11 client adds new functionality to make this possible. You need to bypass the cloud login screen by signing in with the SDK before launching the desktop client:

using Laserfiche.ClientAutomation;
using Laserfiche.RepositoryAccess;
using System;
using System.Collections.Generic;
using System.Linq;

namespace CATCloudLogin
{
    class Program
    {
        static string cloudRepository = "r-01010101.laserfiche.com";
        static string cloudCustomer = "111222333";
        static string username = "myuser";
        static string password = "mypassword";

        static void Main(string[] args)
        {
            try
            {
                Launch();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

        static void Launch()
        {
            // Sign in to LF Cloud using the SDK
            CloudTicket cloudTicket = CloudLogin();

            // Create a session to connect to our LF Cloud repository
            Session cloudSession = Session.Create(cloudRepository, cloudTicket);

            List<int> generatePageEntryIds;

            // Find the documents to generage pages on
            using (Search search = new Search(cloudSession, "({LF:Basic~=\"SAMPLE\", option=\"LTN\"})"))
            {
                search.Run();

                SearchListingSettings searchSettings = new SearchListingSettings();
                searchSettings.AddColumn(SystemColumn.Id);

                using (SearchResultListing results = search.GetResultListing(searchSettings))
                {
                    generatePageEntryIds = results.Select(row => (int)row[SystemColumn.Id]).ToList();
                }
            }

            // Launch the desktop client with our cloud connection
            LaunchOptions launchOptions = new LaunchOptions();
            launchOptions.ServerName = cloudRepository;
            launchOptions.RepositoryName = cloudRepository;
            launchOptions.CloudCustomerId = cloudCustomer;
            launchOptions.SAML = cloudTicket.GetSamlToken(); // This tells the client to use our existing cloud connection
            launchOptions.HiddenWindow = true;

            using (ClientManager clientMgr = new ClientManager())
            {
                MainWindow mainWindow = null;
                clientMgr.LogIn(launchOptions, out mainWindow);

                GeneratePagesOptions genPagesOpt = new GeneratePagesOptions();
                genPagesOpt.ShowUI = false;

                mainWindow.GeneratePages(generatePageEntryIds, genPagesOpt);
            }
        }

        static CloudTicket CloudLogin()
        {
            CloudTicketRequestSettings ctrSettings = new CloudTicketRequestSettings();
            ctrSettings.AccountId = cloudCustomer;
            ctrSettings.UserName = username;
            ctrSettings.Password = password;
            CloudTicket cloudTicket = CloudTicket.GetTicket(ctrSettings);

            return cloudTicket;
        }
    }
}

One caveat: this won't work through Workflow, because ClientAutomation needs to be run in an interactive session.