I think spirit-shift itself is already very powerful. Why enhance it?
Mine is a convenience concern, rather than a power concern.
As I mentioned, having those abilities 1/rest makes you instinctively "save" them for the one tough encounter that actually never comes before you rest. In the case of Cat Flurry Attack, it can be easily replaced with Outlander's Frenzy, which is as good if not better (and is 1/encounter); not sure how the Stag's carnage would play out as 1/encounter but it is pretty much the form's perk—without it, there would be no reason to pick Stag and to be honest, if it's only going to be there 1/rest then why pick Stag indeed? Rather roll a Barbarian who has the ability on all the time.
My point being that the increase in convenience would be greater than the increase in power; of course it's fine if you disagree
Edited by AndreaColombo, 10 October 2016 - 12:45 PM.