I don't now if it is only a "goverment hobby" in DACH Region, but here sometimes the VAT changes for some products (actually limited for a year for restaurants etc.) and so it would be great if BC could support these more than today.

Today you have to change the vat posting group for the items at the deadline day and have to ensure that all postings before the deadline day have the old Posting Group and all postings after the deadline have the new Posting Group. That's very error-prone.

It would already help if there is a starting date in VAT Posting Matrix so that it BC estimate the correct VAT per Posting date.