On a related... tangent... of idle thought,
...would it be possible to go the other direction, and voluntarily run through action (in RT) at slower-than-realtime? This might be useful in particularly complicated situations, so the user isn't quite as hampered by reaction time, without the stutter of rapid pause/scroll/unpause cycles.
Might also be more pleasant than full pausing in MP, as long as it's done in intervals of some length, perhaps limiting the total amount of slow-time per game. I'd prefer to let the MPers judge whether or not it'd be useful for MP, 'tho.