Strange requirement for VPN activation

I just was on the same position as you and just thought ... What .. the ... **bleep**. This restriction makes absolutely no sense. 

This restriction should defentily be removed from the 'advanced' settings, given that advanced users should know about dynamic/static ips and dynamic dns

For thouse who don't want to register for a silly ddns provider, here's a small codesnippet - just paste it in the browser web console (Developer Tools), this will overwrite the exiting check_openvpn function and lets you save the vpn settings (see line 5)

function check_openvpn(d) {
    var c = 0;
    var a = parseInt(d.vpn_port.value, 10);
    var b = parseInt(d.tun_vpn_port.value, 10);
    if (false) {
        if (old_endis_ddns != "1" && (old_wan_assign == "0" || (old_wan_assign == "1" && select_basic != "1")) && !(pppoe_get_wan_assign == "1" && info_get_wanproto == "pppoe")) {
            alert("Dynamic DNS service is suggested to be used alone with the VPN Service. Please make sure you will enable the Dynamic DNS service or use Static IP address for your Internet connection.");
            return false
        }
    }
    if (a > 65534 || b > 65534) {
        alert("The Service Port has to be less than or equal to 65534.");
        return false
    }
    if (d.enable_vpn.checked == true) {
        d.hidden_enable_vpn.value = 1
    } else {
        d.hidden_enable_vpn.value = 0
    }
    if (d.vpn_type[0].checked == true) {
        d.hidden_vpn_type.value = "udp"
    } else {
        if (d.vpn_type[1].checked == true) {
            d.hidden_vpn_type.value = "tcp"
        }
    }
    if (d.tun_vpn_type[0].checked == true) {
        d.hidden_tun_vpn_type.value = "udp"
    } else {
        if (d.tun_vpn_type[1].checked == true) {
            d.hidden_tun_vpn_type.value = "tcp"
        }
    }
    if (d.vpn_port.value == d.tun_vpn_port.value) {
        alert("Can't use the same port in TUN mode and TAP mode.");
        return false
    }
    d.hidden_vpn_port.value = d.vpn_port.value;
    d.hidden_tun_vpn_port.value = d.tun_vpn_port.value;
    if (d.vpn_access[0].checked == true) {
        d.hidden_vpn_access.value = "auto"
    } else {
        if (d.vpn_access[1].checked == true) {
            d.hidden_vpn_access.value = "all"
        } else {
            if (d.vpn_access[2].checked == true) {
                d.hidden_vpn_access.value = "home"
            }
        }
    }
    if ((d.enable_vpn.checked == true) && ((check_all_port(a, d.hidden_vpn_type.value) == false) || (check_all_port(b, d.hidden_tun_vpn_type.value) == false))) {
        alert("The specified port(s) are being used by other configurations. Please check your configurations of USB Readyshare, Remote Management, Port forwarding, Port Triggering, UPnP Port Mapping table, RIP, and Internet connection type");
        return false
    }
    if (d.enable_vpn.checked == true && backup_rsp == "") {
        d.hidden_backup_rspToPing.value = rspToPing_value
    }
    if ((d.hidden_vpn_type.value != type || d.hidden_vpn_port.value != port || d.hidden_vpn_access.value != access_mode || d.hidden_tun_vpn_type.value != tun_type || d.hidden_tun_vpn_port.value != tun_port) && d.hidden_enable_vpn.value == 1) {
        alert("You have changed your VPN Service configurations, please follow the Step 2 and Step 3 to download and install the configuration files on each of your VPN client devices (overwrite existing configuration files).")
    }
    if (d.enable_vpn.checked == true && select_basic == "0" && ((internet_ppp_type == "0" && wan_pppoe_demand == "1") || (internet_ppp_type == "1" && wan_pptp_demand == "1") || (internet_ppp_type == "3" && wan_mulpppoe_demand == "1") || (internet_ppp_type == "4" && wan_l2tp_demand == "1"))) {
        if (confirm("If you enable the VPN service on your router, your router's Internet connection mode will change from Dial on Demand to Always On. This change is required for a VPN client to connect to your router. Do you want to continue?") == false) {
            return false
        }
    }
    if (d.enable_vpn.checked == true && select_basic == "0" && ((internet_ppp_type == "0" && wan_pppoe_demand == "2") || (internet_ppp_type == "1" && wan_pptp_demand == "2") || (internet_ppp_type == "3" && wan_mulpppoe_demand == "2") || (internet_ppp_type == "4" && wan_l2tp_demand == "2"))) {
        alert("If you enable the VPN service on your router, you need to change your router's Internet connection mode from Manually Connect to Always On in order for a VPN client to connect to your router. Go to the Internet Setup page to make this change.")
    }
    return true
}