Just to piggyback on Dustins answer, if you do not want to fork our UI, you can still build a custom UI/modal and add your own buttons, and use our APIs to add functionality to your buttons. You can reference our open source UI to see how we implement certain functionality.
It should be as simple as building a little floating modal and adding the buttons you want.
Since this ticket is extremely vague and open ended, I am going to close it for now. If you come across any more specific questions while building your solution, feel free to open a new ticket.
Thank you!
Logan