I wouldn't use the word supercharge in that case, unless you were planning on making your own head explode or make it more rigid or strong. (physiologically)
I would like each character to have a very specific ability. If you have the power to supercharge things then that would be the full scope of your ability, though you could be versatile in it's execution. Like supercharging walls to make them explode or stimulating molecules to cause elemental change in the environment or replenishing something that ran out of energy. 

However, I would allow Hyper Intuition. The ability to manipulate neural electricity to stimulate brain capacity, activity, and processing. That is a perfectly alright ability. Though it wouldn't be a subset of supercharging so much as it would be a specific skill all its own.