I'm pretty sure we canceled our relo benefit, or something to that effect. I remember seeing an internal note about it some time ago. I know we at least help/entirely cover a month or two of housing in SF if you're moving for work, not sure of anything on top of that. Perhaps someone else who has relevant experience can confirm.
Commuter benefits are $100/mo on a card that you can use for predesignated "commute" purchases - basically, either at parking meters OR on Bart/Caltrain cards/passes. You need to pick which mode you want and it can't be changed adhoc.
I use the BART mode and just load $100 onto my Bart card each month.