Hi Aderson,
I made the change to the configfile per you instruction and it didn't seem to make any difference.
In the /DesktopModules/Admin/RadEditorProvider/ConfigFile there are actually three files: configfile, ConfigFile.xml.Original, and default.ConfigFile.
I then tried it in the other two files with same result.
Whenever I click O.K. on the hyperlink manager, the hyperlink property reverts back to the short URL.
Hutch