It makes sence to change the separator to avoid conflicts with masked HTML characters. (e.g. the german Umlaut “ä” which is masked ä contains a semicolon.
We have written a little patch to fix that problem. You can download it here:
http://www.artvera.de/View-details/Oxid-Downloads/1-Separator-Patch-fur-4.1.3_19918.html