The only one here who seems to have a grasp on what is going on is JAYTO. The rest of you to varying degrees are a managements wet dream.
Here is how this is going to play out.
Forget about outbound flights from Dubai. The company couldn't give a toss about your leave or days off.
Inbound, on a confirmed ticket, to start a duty on return, is what this is all about. As JAYTO said, the jumpseat is now a commercial ticket. Expect in the near future a clarification in one of those 'Today Brian talks about...' pieces of drivel. It will be made quite clear that should you be returning to Dubai on a confirmed seat, and turn down the jumpseat if offered because the cabin is now full, you will be marked absent if you miss your duty, with further disciplinary action. So, sorry HALAS, you won't be able to just go back to the hotel with no repercussions.
Our staff travel is now to be used as commercial tickets. End of.