The one about List Content Type is reported already: https://jira.ez.no/browse/EZP-21681.
Couldn't find one about the users thing, please report it. Note that the roleId thing, if it doesn't work as expected, qualifies as a bug, while the list without parameters would be an enhancement.
Views aren't really implemented yet. You can execute a view, but it isn't saved.
A pull request makes sure that unimplemented features will return the proper response (Not Implemented): https://github.com/ezsystems/ezpublish-kernel/pull/670. (