The rod isn't going to load for a normal cast when you've only got a short amount of line out (also depends on what rod you were using; this will be more of a problem with heavier rods), but you still have a couple choices. If you're nymphing and within a rod length or two you can use the water tension of the line when it's dangling downstream of you to flip your nymphs upstream and high stick or czech nymph (check google or ask Max for a lesson) through the drift (this can also be done with streamers). Another technique with streamers is to fish upstream of your target while swinging into the lie you want to fish, and slowly take steps downstream to cover the entire area.
Both the scandi and skagit lines are shooting heads, just designed for two different styles of fishing, so you will have to strip both in in order to recast them.