That looks very cool. I'll give it look once I have the little guy put to sleep. Meanwhile, I think I have a prototype write up for powers. Or most of one. I'm going to steal from Worlds in Peril and have the player write it up narrative, but with some mechanical guidance.
First, there are a series of questions that will help detail what the power is and what it does, each question tied to a mechanical use of the power.
First: What does you power do? This is the base power, in this case a straight +1d tied to a skill, no cost.
My character can produce a lightning field around his fists. (+1d to Scrap in melee)
Second: What can you power do if you push yourself? This the standard 2 stress push. Options include potency, quality, scale, and range. Other things at GM discretion.
I can push myself to fire lightning bolts from my hands. (+1d to Scrap at range, potency)
Third: What can your power do at the risk of burning yourself out? I'm not sure of the mechanic, maybe more stress and/or trauma and potential loss of power for the scene or job. ( I think this is where any significant AoE gets slotted)
In an emergency I can create a lightning field around me that electrocutes everyone within 10 feet. (+1 d, potency)
Fourth: What else might you be able to do with your power? This is cross-skill, costing 2 stress (?). Too many possibilities to mention.
I might be able to create a lightning shield to absorb incoming blows in melee. (+1d to resist w prowess in melee).
The last question is not supposed to be limiting, I would want players to think they can creatively use their power in any way that makes sense. Same with all the questions really. For each question I'll try to provide a whole list of possibilities, with at least one example done like this for the range of possible skills. This power would be represented as one pip on the character sheet, much like an action, but not tied to an ability. I'm not yet sure about XP cost, nor how to add more pips. Maybe another pip adds to the base skill, and changes instances of 1d in the write up to 2d. I'd probably gate powers past a certain point behind an ability or crew upgrade (like Master Level Training). More than one power would also probably have to be gated, probably pretty heavily.
I also think that extraordinary skills that aren't powers could be done using the same system.