How do I configure Wi-Fi credential timeout or band settings?

Question

When using SDK 2.6.x, I didn't know about Wi-Fi Credentials, so I connected to Wi-Fi as follows: 
 (Partially omitted) 
 struct net_if *iface;
	static struct wifi_connect_req_params cnx_params;

	// Parameter(s)
	iface = net_if_get_default();
	cnx_params.timeout = 30;
	cnx_params.band = WIFI_FREQ_BAND_UNKNOWN;
	cnx_params.channel = WIFI_CHANNEL_ANY;
	cnx_params.security = m_system.security;
	cnx_params.mfp = WIFI_MFP_OPTIONAL;
	cnx_params.ssid = m_system.ssid;
	cnx_params.ssid_length = strlen(cnx_params.ssid);
	cnx_params.psk = m_system.password;
	cnx_params.psk_length = strlen(cnx_params.psk);

	// Connect
	err = net_mgmt(NET_REQUEST_WIFI_CONNECT, iface, &cnx_params, sizeof(struct wifi_connect_req_params));
 
 With the release of SDK 3.1.1, I learned about Wi-Fi Credentials, so this time I'm connecting using Wi-Fi Credentials. 
 The code is very simple. 
 (I think this is the biggest reason to use Wi-Fi Credential) 
 // Connect
 if (net_mgmt(NET_REQUEST_WIFI_CONNECT_STORED, iface, NULL, 0) == 0) {
 LOG_INF("Connecting to Wi-Fi using stored credentials");
 } else {
 LOG_ERR("Connection request failed");
 }
 
 However, I feel like I can't set the timeout or the bandwidth to use like before. 
 How do I set them up?