The point of 'real time with pause' is to allow most of the action to happen in real time with pausing only when you need it. For most of the games that use it, this amounts to a healing or 'out of ammunition' pause, or for allowing you to give orders to multiple characters in extremis.
For most fights you won't need it and most likely won't bother with it. It's not supposed to be any kind of surrogate for turn based combat.
