Provided way of passing in values for per frame shadow update budgets.

ScriptableRenderPipeline/Core/CoreRP/Shadow/Shadow.cs

             public VectorArray<ShadowPayload>   payloads     { get { return m_Payloads;    } set { m_Payloads = value;    } }
         }
 
+        public struct ShadowBudgets
+        {
+            public int maxPointLights;
+            public int maxSpotLights;
+            public int maxDirectionalLights;
+        }
+
         private const int           k_MaxShadowmapPerType = 4;
         private ShadowSettings      m_ShadowSettings;
         private ShadowmapBase[]     m_Shadowmaps;
             // and register itself
             AdditionalShadowDataEditor.SetRegistry( this );
 #endif
+        }
+
+        public ShadowManager(ShadowSettings shadowSettings, ref ShadowContext.CtxtInit ctxtInitializer, ref ShadowBudgets budgets, ShadowmapBase[] shadowmaps ) : this( shadowSettings, ref ctxtInitializer, shadowmaps )
+        {
+            SetPerFrameBudgets( ref budgets );
+        }
+
+        public void SetPerFrameBudgets( ref ShadowBudgets budgets )
+        {
+            m_MaxShadows[(int)GPUShadowType.Point      ,0] = m_MaxShadows[(int)GPUShadowType.Point        ,1] = budgets.maxPointLights;
+            m_MaxShadows[(int)GPUShadowType.Spot       ,0] = m_MaxShadows[(int)GPUShadowType.Spot         ,1] = budgets.maxSpotLights;
+            m_MaxShadows[(int)GPUShadowType.Directional,0] = m_MaxShadows[(int)GPUShadowType.Directional  ,1] = budgets.maxDirectionalLights;
         }
 
         public override void UpdateCullingParameters( ref ScriptableCullingParameters cullingParams )

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/LightLoop.cs

             scInit.dataSyncer                        = syncer;
             scInit.resourceBinder                    = binder;
 
-            m_ShadowMgr = new ShadowManager(shadowSettings, ref scInit, m_Shadowmaps);
+            ShadowManager.ShadowBudgets budgets;
+            budgets.maxPointLights       = 6;
+            budgets.maxSpotLights        = 12;
+            budgets.maxDirectionalLights = 1;
+
+            m_ShadowMgr = new ShadowManager(shadowSettings, ref scInit, ref budgets, m_Shadowmaps);
             // set global overrides - these need to match the override specified in LightLoop/Shadow.hlsl
             bool useGlobalOverrides = true;
             m_ShadowMgr.SetGlobalShadowOverride( GPUShadowType.Point        , ShadowAlgorithm.PCF, ShadowVariant.V2, ShadowPrecision.High, useGlobalOverrides );