nova-vm-snapshot-CRUD&rollback&upload

at the present, We can use the following combined commands to achieve the snapshot function. but it is too complicated.

vm snapshot create:
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   nova image-create
   cinder snapshot-create

vm snapshot delete:
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   glance image-delete
   cinder snapshot-delete

vm snapshot list:
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   glance image-list --property-filter <then sort by create time>
   cinder snapshoe list --volume-id <thenn sort by create time>

vm snapshot rollback:
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   nova rebuild
   cinder create --snapshot-id

so, can we provide new api to achieve this?
for instance: nova snapshot create/list/delete/rollback/upload