Running Protractor against dev/trunk/master selenium server

The Story:

Protractor itself is coming with a built-in webdriver-manager command line tool:

The webdriver-manager is a helper tool to easily get an instance of a Selenium Server running. Use it to download the necessary binaries with:

webdriver-manager update

Now start up a server with:

webdriver-manager start

According to webdriver-manager binary source code, it uses config.json to download a specific selenium package version into a selenium directory in the protractor package root. For instance, now the config looks:

{
  "webdriverVersions": {
    "selenium": "2.48.2",
    "chromedriver": "2.20",
    "iedriver": "2.48.0"
  }
}

This config is then manually updated when new selenium, chrome or IE driver versions come out.

For this config, running webdriver-manager update would trigger a selenium-server-standalone-2.48.2.jar to be downloaded.

The Question:

Is it possible to have webdriver-manager to install the currently latest/dev/trunk/master selenium version? And, if not, how can I run protractor tests with the latest dev selenium package version?