I've found another minor issue with inline editing, reproduced on the demo site.
Editing inline does not update the "Modified by" property of HTML Content. It does update the last modified date. The entries in the "Previous Versions" history are similarly wrongly attributed, perhaps to the user who first created the content (I've not exhaustively tested the illogic here).
This is without Content Workflow, but I've seen the same issue on a site with this switched on.