External URL names that contain square brackets break the linking

DESCRIPTION
External Linking: URL names containing square brackets does not link

STEPS TO REPRODUCE:
1. Edit in Rich Text
2. Click the "Insert/edit link" button -- the Link Properties window will appear
3. In the "Link" text box type: http://www.mysite.com/Document[foo].doc
    In the "Alias" text box type: My Document
    Click OK
4. OBSERVE: The Rich Text page looks fine.  -- There is a link named "My Document" underlined.
5.Click the Save button and you will be returned to the View page
6. OBSERVE: The link has now been changed to: 
    [My Document|http://www.mysite.com/Documentfoo.doc]

COMMENTS
In my company the square bracket is part of our document naming convention and is not easily changed (1200+ documents).
We were hoping to roll Confluence out by Christmas however this issue has brought it us to a standstill.  
It has been mentioned that we can use ([), however this is not practical as it is not intuitive and requires 
documentation for any user linking to any of our documents.

SUGGESTED RESOLUTION
Change the default linking character -- i.e. [[double]] brackets instead of [single] brackets