Alas… it was staring me in the face… onoff… and here I thought that was just for the direct pin manipulation part of Blynk (e.g. setting a Button Widget to a digital pin).
OK, I now have added physical button (momentary switch) controlling the physical LED as well as another LED Widget… yahh!!
Here is my test code as it currently stands… very messy, uncoordinated and somewhat commented, but it works 
Anyone have a better way of editing Javascript in a terminal window than nano?
var Gpio = require('onoff').Gpio; // links variable 'Gpio' to the all important onoff GPIO control library
var Blynk = require('blynk-library'); // Links variable 'Blynk' to the Blynk Library
var AUTH = 'cda957435ce44407bed2e9283c95018f'; // My top secret auth code... useless to anyone on the cloud ;P
var blynk = new Blynk.Blynk(AUTH, options = { connector : new Blynk.TcpClient( options = { addr:"10.10.3.13", port:8442 } ) }); // Connects to my local server... nener nener not for you!
var v1 = new blynk.VirtualPin(1); // Setup Button Widget on V1 with variable 'v1'
var v9 = new blynk.VirtualPin(9); // Setup Display Widget on V9 with variable 'v9'
var v10 = new blynk.VirtualPin(10); // Setup LED Widget on V10 with variable 'v10'
v1.on('write', function(param) { // Watches for V1 Button
console.log('V1:', param[0]); // prints value to CLI
if (param == 0) {
blynk.virtualWrite(10, 0); // V10 Widget LED on
} else if (param == 1) {
blynk.virtualWrite(10, 255); // V10 Widget LED off
}
});
v9.on('read', function() { // I don't understand why this says read??
v9.write(new Date().getSeconds()); // but this sends the seconds 0-59 to the Display Widget
});
led = new Gpio(18, 'out'), // Sets up the BCM pin 18 as an output for the LED and assigns it variable 'led'
button = new Gpio(25, 'in', 'both'); // Sets up the BCM pin 25 as an input registering both rising and falling for the variable 'button'
button.watch(function (err, value) { // Watches for button press and assigns 0/1 to value
if (err) {
throw err;
}
led.writeSync(value); // Sends value (0/1) to Physical LED
if (value == 0) {
blynk.virtualWrite(2, 0); // V2 Widget LED on
} else if (value == 1) {
blynk.virtualWrite(2, 255); // V2 Widget LED off
}
});
process.on('SIGINT', function () { // This is apparently a cleaner exit upon CTRL-C... I dunno??...
led.unexport();
button.unexport();
});