How can I conditionally suppress logging in Express (or Connect)?

When using the logger middleware which is part of Connect (as well as Express), I would like to be able to disable logging on certain requests, say by setting a flag on the response or something.

I managed to do it by saying:

res.doNotLog = true;

and then, deep in logger.js (part of the Connect module), I put

if(res.doNotLog) return;

in the right place. But of course I don't want to be modifying code in the module itself. Is there any way I can cause the same to happen without having to hack the module?

Edit:

This worked:

var app = _express.createServer();

// set 'hello' routing...note that this is before middleware 
// so it won't be logged
app.get('/sayhello', function(req, res) {res.send("hey");});

// configure middleware: logging, static file serving
app.configure(function() {
    app.use(_express.logger());
    app.use(_express.static(__dirname + '/www'));
  });

// set 'goodbye' routing...note that this is after middleware 
// so it will be logged
app.get('/saygoodbye', function(req, res) {res.send("later...");});