Hello,
I have already implemented a checkbox for “Show zero balances” and it will be available on the next release.
About your other query, regarding UI buttons, there are several ways to do this, but it’s not something that can just be added to the plugin because it’s way too specific a requirement. I’m thinking maybe some frontend JavaScript could do it, on the wallets_ready event. Another solution would be a new static PHP template that is specific to your requirement. Please open a new thread about this if you can and let me know which approach you prefer.
with regards