None whatsoever. The difference between using a feat at an improv modifier because it's not quite right, and improvising a new feat that is spot on, is grey indeed.
In response to James Turner's valid point about "Blade of Flame" using "Fire" ability, as against CC: If they don't have "Using Blade of Flame" as one of their CC combat styles, though, then they're going to be at -3, and I would probably tell the player that their "Blade of Flame" feat has to be an edge rather than a bonus, with a base weapon rank of 0. Sound fair? We're all learning here.
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