Game changing feature for where you have lots of transactions between spouses. Certainly in the UK a transaction between a spouse as a gift does not incur a tax charge.
But by default Koinly thinks this is a disposal as the spouse wallet is not in Koinly. So if you could tag a wallet to a particular person ie Husband / Wife - then this would ensure the default transfer could be a gift.
You could then extend Koinly to calculate transactions and tax for both users under one account, with additional cost of course.
This would be a huge timesaver, and allow for easier consolidation of these wallets and transactions.