Yes. Offering comments is available if your company activates that functionality. And if your company does, be careful not to give away your identify in the way your write (i.e. using phrases that people easily identify with you) because anonymity is a key component to Ripple!!
That is a decision your employer makes. However, Ripple is able to confirm the final Ripple Effect Score you had at your prior employer to use at your new employer (to the extent the new employer uses Ripple… and if not, maybe they will!).