PopClip Feature Request: Show Only on Modifier Key plus Text Selection

Hi @nick

Would you consider adding an option to show PopClip only when a modifier key is held during text selection, for example ⌥ plus select text?

Right now PopClip appears whenever text is selected, and while I know there is also a keyboard shortcut to explicitly show PopClip, that approach adds friction because you have to remember and press the shortcut each time. A modifier plus select gesture would feel more natural and faster, since it stays part of the normal selection flow while still preventing PopClip from appearing unintentionally.