I find my click finger getting tired when I'm using the metasurface ;)
A small feature which would be pretty useful for heavy users of the metasurface: in interpolation mode, have a way of toggling between the standard mode (click and drag) and a new mode where the click isn't necessary (the snapshot interpolation is done purely based on the position of the pointer in the metasurface).
(Could perhaps only be an option in full-screen mode.)
This mode would probably be best toggled via the context menu and/or a keyboard shortcut.
It would also probably be very convenient for people using touchpads like most laptops come with, rather than a normal mouse.