You can already do some of this: "Land Revision" itself is added to the menu via DifferentialLandingActionMenuEventListener. You can use listeners like this to extend the menu.

We are generally moving away from event listeners as extension mechanisms and toward dedicated extension classes, so you may need to make minor API changes in the future, but I plan to support this extension mechanism in some form forever (we use it in the upstream for Subscriptions, Tokens, Flags, etc., although some of those may move to Curtain extensions soon). You can use this to add actions to any object, including commits in Diffusion.

Reporting is a bit more difficult. Most simply, you can, e.g., use a custom field like the the one in P1947 to add a message to the top of the page, like this:

Instead, that could say "this is merging" or "this merged as XYZ" or whatever. This will be less flexible than the upstream version of the element, though, and won't automatically update.

To get the upstream version you need to subclass DrydockRepositoryOperationType, but repository operations currently assume they operate on a repository, so you can't implement one that does nothing and just reports the status of a different operation. I don't currently plan to change this.

I'd maybe suggest something like this:

• Use a Listener to add your action.
• Use a custom field to add status.
• If you want an auto-updating status, build it on a separate page, have the action redirect the user there, and link to that page from the status. Or use the external queue system page for this.