Hi,
LineCast is a different kind of raycasting on how you set it up, but in terms of recurence, it's subject the option you pick inside the action.
do you mean the jumping is not suitable there too? that's fine if it isn't, I am trying to understant what you are after.
if you want it to fall faster on its way down, then use you'll need to mess with giving it a kick with add force when you detect it's going down ( check the height and when the new height is lower than the last height, it's going down)
Bye,
Jean