I am delighted to see OSC52 support in KiTTY, but needing to answer a prompt (the "Allow OSC52 clipboard sync?" popup) every time I make a selection in Tmux is rather annoying -- especially since I must answer the prompt to continue using the terminal. It would be nice to have a checkbox that says "don't ask me again" or "always allow OSC52 clipboard sync." Or maybe this is best configured in session settings.

I'll leave the solution up to you, but I don't think it is reasonable to continually answer this prompt when using this feature.