Component controller enhancement

Hi All,

I would like to do an enhancement for a component controller in IS_SAVE_NEEDED method for below component.

Component:BT120H_CPL

Component controller class:CL_BT120H_C_BSPWDCOMPONEN_IMPL

Method:IS_SAVE_NEEDED

I never did a component controller enhancement. Just wanted to hear comments from the people who did it before. The specific questions i have

1) Is it allowed to enhance the component controller.

2) Steps to enhance.

3)Can we revert back component controller once it's enhanced & Steps to revert back the component controller without Issues like Dumps and component controller deletions.

I appreciate your help on this.

Thanks,

Sarala.