So, the rules for Jump state that you can jump as part of any action that allows you to move. Shifting is an action that allows you to move. Is it possible, then, to shift and then immediately jump? The jump itself would still provoke OAs, I assume, but I see no reason you wouldn't be able to do it. Expanding on this, can you jump as part of attacks with movement elements, such as the Barbarian's Whirling Lunge power, moving beyond the power's normal range in the process?