打击乐内容管理系统是否可以自定义（以编程方式）？

Just wondering if anyone out there has recent experience programming in the Percussion CMS environment. Is it pretty "locked down", or when you find that the default admin settings won't facilitate achieving some type of functionality, can you get to the source code files and/or the database and really make it do what you want? Is there an API?Just wondering if anyone out there has recent e