Yes, (at least I think so). If a user doesn't have the specific permission necessary to use a context menu item, they shouldn't see it. There were some bugs with this, but I think they've been fixed.
If you look at the Administrator Policy, you'll see specific permissions related to those things. If you duplicate it, uncheck them, and assign the duplicate policy to the users in a Context Access ACL entry, those options shouldn't appear in the context menus.
For more info, go
HERE, and go to MODX -> MODX Security Permissions.
There's also a video of me
HERE, explaining the whole permission system. It's almost an hour long.
