Hello,

We would like to keep one single central of copy of SS, probably like this

/usr/local/apache/www/Silverstripe
                                           - framework
                                           - cms
                                           - shared modules 1
                                           - shared modules 2

and then each hosting account

/home/company1/public_html/SS_custom_files
                                                         - local-config1
                                                         - themes/theme1

and another account

/home/company2/public_html/SS_custom_files
                                                         - local-config2
                                                         - themes/theme2

Looks like Yii Framework is quite flexible

http://stackoverflow.com/questions/15109494/how-to-reuse-code-across-multiple-domains

would like SS has the same capabilities to allow multiple hosting accounts sharing one core