I have unlocked so far two of Captain Cold's abilities.
1) Upward Ice Blast (Iceshot), it's similar to original Sub's diagonal Iceball. Would be interesting as the second AA.
2) Ice Burst: Replaces horizontal Ice Blast by just shooting an ice shockwave to push back your opponent. It's way stronger than the Wall itself. It's a Soft KD, similar to his 213. I would end the combo with this. Not for zoning. It's an amazing ability, but useless, if it replaces the Ice Burst. For me, the replace shows that NRS is bored to implement this ability to a different keybinding.
There's, also, his air Ice Floors, which would be important to his gameplay to save his ass against his zoning opponents. I would use the Ice Floor to help me decide my next move based on those three distancing choices:
Far away: Set the ice trap or just shoot the Big Freeze for downward zoning.
Medium: Jump on the opponent the moment he tries to zone you out or just set an ice trap.
Close: Possibly for corners. I would wait till they start waking up. Would be an amazing tech to OKI them. Either you do the Close Icicle again, or you jump back for a cross-up JI in case they try to escape.
So, I concur on the idea of implementing the competitive mode ON abilities. You may let the scrubs use the competition mode OFF stats and abilities all the way however they like, but we NEED those abilities to ours side (competition). The problem would be to remap the keybindings for the abilities, because they have the same keybindings, like Ice Burst and Ice Blast, yet there are a lot of other keybindings they never bothered to implement for each ability.