-s:tab("expert", translate("niu_expert", "Expert Settings"))
-start = s:taboption("expert", Value, "start", translate("m_n_d_firstaddress"))
-limit = s:taboption("expert", Value, "limit", translate("m_n_d_numleases"), "")
-time = s:taboption("expert", Value, "leasetime")
+s:tab("expert", translate("Expert Settings"))
+start = s:taboption("expert", Value, "start", translate("First leased address"))
+limit = s:taboption("expert", Value, "limit", translate("Number of leased addresses"), "")
+time = s:taboption("expert", Value, "leasetime", "Lease Time")
+local dd = s:taboption("expert", Flag, "dynamicdhcp", "Also generate addresses for unknown devices")
+dd.rmempty = false
+dd.default = "1"