A temper switch does not create forks, like the multitasking mod. Neither does it accommodate an additional ego, like the multiple personalities augment. A temper switch provides a virtually instantaneous transition between sets of attitudes and values.
The earliest and still most common use is to maintain two value sets: one normal, and one "cold". The normal set is the one the ego possesses naturally, as if the temper switch did not exist. The "cold" set emphasizes completion of goals and efficiency, deemphasizes the immediate value of life and importance of taboos, and has a minimized response to traumatic situations.
Temper switches are most regularly used by those in highly stressful and/or traumatic situations where efficient performance of duties is a priority. Doctors, emergency personnel and soldiers were the early adopters. The switch is most effectively used by those in institutions with established temper switch care facilities: after switching back, all the stress and trauma experienced by the 'cold' personality suddenly bombard the normal ego. Without immediate and sustained care, the trauma can easily be irreversible.
Installation of a temper switch is a psychosurgery procedure.
Once switched, an ego will take 1d10/2 SV per hour, in addition to any other SV taken. The ego will not, however, suffer any traumas or resulting disorders and derangements. Once switched back, all SV and their consequences are suffered immediately.
Timeframe: 1 week