Custom command field

Greetings Gurus. feature request, Simple but powerful.
Add a custom text field that executes a custom command and injects the text of the field into the custom command.


An example of a command would be
chrome.exe "? {Field}"
So when a user types in the field the text would be inserted into the command and the command would then be executed when Enter is hit. In this example chrome would fire up a new tab and search for the text.

Although you can achieve this with a Modal popup dialog, it would also be cool to have the option of a textbox field on a custom toolbar. Providing a way to set watermarked text for when it's empty would be cool because it establishes context if one has multiple fields on a toolbar. Naturally add custom background and foreground colors. Even Icon support would be cool (right justified like the search field above).