Choosing either CGST & SGST or IGST

In your instructions you don’t say anything on how to choose either CGST + SGST or IGST. As it is now I have to create one row for each state in the TAX settings for IGST. Is it not possible to change the plugin so that if you chosse a state for CGST + SGST then that state will be removed from IGST states? In that case I can choose all states for IGST and doesn’t have to create one row for each state.