Issues with defining hostgroup via hammer on Red Hat Satellite 6

Issue

1. In hostgroup creation using hammer command utility, capsule is referred to as "content source" and the only way to specify it is through "content-source-id", rather than by either name or ID. Is it possible to address it by name?
2. How to attach a activation-key with hostgroup when creating it using hammer command?
3. The hammer hostgroup sc-params does not seem to work with options --hostgroup or --hostgroup-id:

#  hammer hostgroup sc-params --hostgroup "TestGroup"
missing param 'hostgroup_id' in parameters
# hammer hostgroup sc-params --hostgroup-id 7
missing param 'hostgroup_id' in parameters