Feeder class enhancement for Incident creation(EHHS 3.0)

Hi,
I need to add extra fields in incident creation/change and store in custom table for incident.

I identified following steps.

1) Create web dynpro component with assistance class so data selected by user can be accessed in feeder class.
2) Enhance component configuration EHHSS_INC_REC_GAF_V3 and Add newly created web dynpro component as UIBB (free style component).
3) Enhance method PROCESS_EVENT of feeder class CL_EHFND_FBI_GUIBB_FORM(post exit) and store data entered in custom web dynpro in custom table by reading incident key and using it for storing custom data for incident.

I want to know if above approach is good.

Thanks in advance.

Nilesh