ditch
as I understand it the use of the seat is for T/O & landing only -
the staff (crew) companion would use crew rest seats at other times except when crew are using them. - believe it mainly came from the 380 where the crew rest seats are rated at 9g not the 16g required for T/O & landing (which in itself is a triumph for those who did the scope document)
....................would not want to be in the jump seat for the whole sector - been a while, but last time I sat in one I didn't see any IFE, leg rest or tray table and the recline was uncomfortable.....(sounds a bit like a downgrade eh!!!)