Kes and her superior powers and how superior they really are, are part of the VOY novel The Eternal Tide. It even explains to an extend how the Kes from Fury wasn't really Kes, but some form of manifestation of Kes' darker side.
I remember reading that somewhere and that actually got me thinking to a plot point that I'll hopefully be getting to soon.
It makes sense seeing how Fury-Kes was so unlike the Kes many of us knew and loved. Which is why (as seen in the last installment) every time she has a major use of her powers she gets a little older.
Commander Austin Harris, First Officer, Deep Space Nine (by FltCpt. Bossco)
8.01 - Darkest Before Dawn
(Chapter 8 added, 12/09/2015)