These 'specials' wouldn't be for sale in the shop. Nobody should have an advantage in gameplay just because they have more money / have been playing longer.
I suggested something like this to Stebbzor when he was working on the gamemode. Several different actions, including
- telekinesis (pushing props or even opponents)
- high jump
- sprint bursts (dodging)
All of these 'actions' would have a cooldown to make them balanced. Every player could change their selected power each round (when they respawn) and some powers might need to be unlocked first (not sure about this).
The idea was dropped for some reason though. If you can get Stebbzor to work on it, it would probably be included on the server.