Beanshell scripting with Java web based application

I am working on web based java application, where we want to allow user to write beanshell script to enhance the automation script of selenium. We record the steps performed by user but that is not sufficient as there might be other peace of code required which are purely java class code or like beanshell script. If I am not wrong then we can write class like code in beanshell and can run.

I need to know who I can achieve this? Is there any other way we can achieve this? Is there any limitation in beanshell to use it will java web based application?

We need to make sure that user is able to create object or class and also able to call methods and other stuff like normal java code allow.

I would appreciate your inputs and your guidance.