Snap to intersection using the function key, how to?

Hi,

I'm doing a bunch of shape edits and need to extend corners to 'construction line' intersections. Currently I edit the shape, select the vertex' and RMB 'Snap to Intersection'.

Is there a way to set that up with a function key (F2) so I can select the vertex ; hover over the intersection of lines ; and hit F2 to do the (RMB/Snap to Intersection) function?

Thanks in advance.