Is it possible to change the title of "Quick Post" dashboard widgets?
You can use this Control Panel JS plugin to change the info.

Just copy the cpjs folder in the craft/plugins/ folder and the plugin should appear in Settings-&gt;Plugins. Install it and add your code in the textarea displayed at the bottom.

Now with your title:

In the dashboard, each widget has an ID like widget1, widget2, etc; get it with the dev tools.

Then try the following code changing the corresponding widget number:

document.getElementById("widget1").childNodes[3].innerHTML = "new_title";