directory website joomla and sobi2 need little modify

i have a directory website that made by joomla and sobi2 now i want more directory on my website,i use subdomain like [login to view URL] [login to view URL] [login to view URL] that means i install 4 and more different website on my host. the problem is i hope one user only register on the main website,he do not need register on all the website. for the sobi2 ,i let user to review all the [login to view URL] has this plug-in. but i find it is too simple,i want the review function like the website [login to view URL] it means vote the entry do not simplly by just 5 stars,but by the total number user vote for it(positive+negative),means user can vore is negative. so the project is 1 synchronization all the subdomain website user database,let the user only register the main website ,then it auto log in all the subdomain websites 2 modify the plug-in review comment [login to view URL] it function like [login to view URL] 3 modify the module ,so i can show top rated by the number user vote for this enrty,like the website [login to view URL] module can show top 10 or what ever number top rated entry in each [login to view URL] the whole directory. if you want bid it,show me some demo you have done,if not i will not reply you. if you want bid it,show me some demo you have done,if not i will not reply you. if you want bid it,show me some demo you have done,if not i will not reply you. if you want bid it,show me some demo you have done,if not i will not reply you. if you want bid it,show me some demo you have done,if not i will not reply you.