I'm requesting adding a subset of the existing Crew related methods to the api.
For example:
GetCrewCapacity ()
GetCrewCount ()
GetVesselCrew()

I'm in the process of writing both a new mod to make us of crew information as well as rewriting my old "KSP PAO" mod to use KSP RPC instead of Telemachus.

Cheers!

I've added Vessel.CrewCapacity, CrewCount and Crew (which returns a list of CrewMember objects) in 2b669e6 Does that cover your needs?