I feel like I'm going to wind up with a case like this. Although the cutscene abilities in my case would not be particularly useful for the gameplay.
One of the main characters in my game is Siiya:

And she is a shape shifter. It's not like X-Men shape shifting though. It's much more like how Samus Can turn into the morph ball, by that I mean it's not exactly like the target, it's still retains physical characteristics specific to Siiya (She can change colors too, but the target form must be made out of pyramid like crystals). Actually during the gameplay a morphball like form is the only means you can use shapeshifting. Although I'm thinking in the sequel she will also be able to turn into much cooler things like a spear, a saw, a drill.
But during cutscenes this ability is much more explored. Even going into weapons and tools. She would partially shape shift into things that seem situationally useful. Which could range from:
Turning her wings into an umbrella.
Turning her feet into talons to enable her to perch on an otherwise difficult to to stand on branch.
Turning her hand into a bear trap, to keep a firm grip on something.
Turning her arm into a hammer to hammer in nails.
These on their own all sound like they could work as neat things for the gameplay. But as Siiya stands right now, she is already quite cluttered with abilities, and pretty much perfect the way she is. Adding anything more would just be too much.
At this point in development, I've got to say asking all of these little questions has helped me shape my game so much that I'm kinda running out of things to need help on.
So I guess this time, I'm asking: Despite this being a small detail. Would it leave a bad impression (make you wonder why you can't do that in game) or would it just make Siiya seem like a cooler character?











