is there mib2c conf for generic table outside agent? (besides the Iterator)

Hey,
 
1) Which mib2c configuration should I use if I want to implement a
generic table which is NOT stored in the agent, but I don't want to use
the Iterator becuase of it's in-efficiency. I'd like to implement myself
the GET_NEXT.
 
2) How do I use the netsnmp_register_table()?
    in paritcular:
     b) where in the registration do I suplly the type of the culomns?
     a) will my registered table handler be called with MODE_GET_NEXT?
 
thanks,
Erez Makavy.