External Script Editor Argument Variable

In Unity you can set an external script editor instead of monodevelop from the menu Edit->Preferences->External Tools->External Script Editor.

External Script Args text box allows you to set the argument / parameters sent to the external program.
For sublime text I currently have (File):(Line)”.
Where unity replaces (File)*** with the file name and ***(Line) with the line number before calling the external editor.

(Note Sublime Text allows for the “:” as a delimiter, with the syntax fileName:lineNumber:columnNumber .)

Is there a $(column) variable, or is there a list/documentation for these variables?

According to the documentation and the release notes of 4.3(other editor features) only “File” and “Line” are supported. Haven’t heard of any others. If they exist they aren’t documented.