How can we improve WHMCS?

As a business owner we need to begin charging VAT once income reaches a certain threshold.

In preparation for this we enabled the Tax Support option a year ago and have been collecting VAT Numbers from clients over time.

Now we are have enabled the VAT Mode and setup Tax rules, including enabling the VAT Number Validation and Auto Tax Exempt functions.

It would be beneficial if upon enabling the VAT Mode and VAT Number Validation, the system would bulk-check all VAT Numbers which may be present in the system already, and validate them.
If a VAT Number is found and valid then mark the Client Account as Tax Exempt.

This would save the manual effort of checking existing Client Accounts for VAT Numbers and marking them Tax Exempt as applicable.
If this is not done, B2B invoices will be issued with VAT charged when they should be exempt.