Added Spec Restrictions on Optimistic Block Import

common/clap_utils/src/lib.rs

@@ -52,6 +52,12 @@ pub fn get_eth2_network_config(cli_args: &ArgMatches) -> Result<Eth2NetworkConfi
             .terminal_block_hash_activation_epoch = epoch;
     }
 
+    if let Some(slots) = parse_optional(cli_args, "safe-slots-to-import-optimistically")? {
+        eth2_network_config
+            .config
+            .safe_slots_to_import_optimistically = slots;
+    }
+
     Ok(eth2_network_config)
 }