Re-enable use of Admin SID in Magento after SUPEE-11314

After SUPEE-11314 or upgrade to Magento 1.9.4.5 use of Admin SIDs is disabled by default, which may affect certain modules (i.e. Sage Pay Suite MOTO payments).
To re-enable use of Admin SIDs we can add corresponding section into backend:

--- app/code/core/Mage/Core/etc/system.xml
+++ app/code/core/Mage/Core/etc/system.xml
@@ -1610,6 +1610,16 @@
                             1
                             0
                         
+                        
+                            Use SID on Admin Backend
+                            Allows admins to stay logged in via SID
+                            select
+                            adminhtml/system_config_source_yesno
+                            60
+                            1
+                            0
+                            0
+                        
                     
                 
                 

After that we Flush Magento cache, navigate to System > Configuration > Web > Session Validation Settings and change value of Use SID on Admin Backend option to Yes. Please do not forget to Flush Magento cache to apply changes.