I'm always needing these settings, so I've got them.
"Where's that (more) complete config file when you need it??" - look no further.

I've also included some BTS process memory throttling options as well - due to a recent Out of Memory Exception I resolved.

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<?xml version="1.0" ?>
<configuration>
   <configSections>
      <section name="xlangs" type="Microsoft.XLANGs.BizTalk.CrossProcess.XmlSerializationConfigurationSectionHandler, Microsoft.XLANGs.BizTalk.CrossProcess" />
    </configSections>

    <!-- these settings are for BTS making HTTP/SOAP calls out, 2 concurrent connections is the default.
         This should be in EVERY system where BTS is calling WebServices -->
   <system.net>
      <connectionManagement>
          <add address="*" maxconnection="40"/>
      </connectionManagement>
   </system.net>
    <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
         <probing privatePath="BizTalk Assemblies;Developer Tools;Tracking;Tracking\interop" />
      </assemblyBinding>
    </runtime>
    <system.runtime.remoting>
       <channelSinkProviders>
         <serverProviders>
            <provider id="sspi" type="Microsoft.BizTalk.XLANGs.BTXEngine.SecurityServerChannelSinkProvider,Microsoft.XLANGs.BizTalk.Engine" securityPackage="ntlm" authenticationLevel="packetPrivacy" />
         </serverProviders>
      </channelSinkProviders>
      <application>
         <channels>
            <channel ref="tcp" port="0" name="">
               <serverProviders>
                  <provider ref="sspi" />
                  <formatter ref="binary" typeFilterLevel="Full"/>
               </serverProviders>
            </channel>
         </channels>
      </application>
     </system.runtime.remoting>
      <appSettings>
         <add key="Key1" value="Hello, World!" />
      </appSettings>
      <xlangs>
         <Configuration><!-- MaxThreshold - "Max time in memory an Orch will reside before dehydrat" MinThreshold - "Min time" -->
               <Dehydration MaxThreshold="1800" MinThreshold="1" ConstantThreshold="-1">
                  <!-- Currently, virtual memory can become a bottleneck on 32-bit machines due to unmanaged heap fragmentation, so you should throttle by this resource as well. -->
                  <VirtualMemoryThrottlingCriteria OptimalUsage="900"” MaximalUsage="1300" IsActive="true" /> 
                  <!-- This is a useful criterion for throttling, but appropriate values depend on whether the box is being shared among servers. If the machine has a lot of RAM and is not being shared with other functions, then these values can be significantly increased.Optimal and maximal usage are in MB.-->
                  <PrivateMemoryThrottlingCriteria OptimalUsage="50" MaximalUsage="350" IsActive="true" /> 
               </Dehydration>
               <Debugging ValidateSchemas="true" ValidateAssemblies="true" ExtendedLogging="true" ValidateCorrelations="false" />
               <AppDomains AssembliesPerDomain="10">
                  <AppDomainSpecs>
                     <AppDomainSpec Name="DemoDomain" SecondsIdleBeforeShutdown="-1" SecondsEmptyBeforeShutdown="12000" />
                  </AppDomainSpecs>
                  <ExactAssignmentRules>
                     <ExactAssignmentRule AssemblyName="Configuration, Version=1.0.0.0, Culture=neutral, PublicKeyToken=3a7d0586c62e754b" AppDomainName="DemoDomain" />
                  </ExactAssignmentRules>
               </AppDomains>
            </Configuration>
      </xlangs>
</configuration>