K98 does not have a straight on bolt, you are thinking of the Gew98. That said, all bolt action rifles can be cocked without moving the gun away, just straight bolts like on the Carcano take a bit longer, the K98 is faster, the Enfield is even faster, and the K31 is fastest.
Either way, yes, it would be rather nice to be able to fire bolt action rifles without breaking ironsight view. But the devs probably have reasons for why they made it that way.