Edit Default Tax Rate from Xero Contacts Template

Hi all,

I am using the Xero Contacts Template v1.3 There is a useful option to change the default purchases and sales account in bulk in columns Q and T. I am wondering why there is no option to change the default sales and vat rate in this template as well? This is an available field in Xero Contacts and it would be very useful if you could do this via the template as well. Any ideas?