version locking - people want it - should we add a new key to repositories such as "tag" or "hash" ? This conflicts with shallow clones eventually
Status update: Version locking could be implemented now that dictionaries get passed to the checkout functions. See a59d517. Thus implementing this is as simple as teaching VAM about appropriate commands and defining how VAM should behave exactly.
It is better to use keyword revision or changeset. It then can refer to tag, hash, branch, bookmark or any other revspec and usually nothings changes if you want to lock on specific branch and not on specific tag. Also add keyword update which may be set to zero (False).