u mean real-time is not the same as 'hidden' turn-based system? as far as i can tell, there is none. referring to the game Fallout Tactics, they call the turn-based system that works continuously like real-time as 'continuous turn-based' system. it feels a whole lot like real-time to me, except with an indicator showing how many action a character can do in a turn (the faster your character is, the more 'action points' he or she has in one turn).
maybe what u would like to have is a delay or amount of time to initiate certain action. for example, pick-locking might take a certain amount of time depending on the level of the 'lock', slashing (with a slashing weapon, like a sword) can be almost instantaneous, casting a very powerful spell will take a substantial amount of time to start.
in the end, i feel a nice game system which doesn't have to be entirely combat-based might resemble the game franchise Commandos (especially 1, 2) where when & how u do what is a strategy rather than just sweeping the place clean of enemies by simply walking here & there.