Impossible to tell if a manually triggered build has succeeded or not

The "Build Now" button on a project does not offer any obvious feedback to say whether the build has been successfully queued or not.

There's also no indication on the "Queues" page as to whether the builds that are listed are scheduled or manually triggered.

As far as I can tell, the "Build Now" button is ignored if there is already a build for the same project somewhere in the queue, but this is not reported back to the user. Or maybe it is just that the "Build Now" button does not always work - one cannot tell.

It would be useful if the button reported success or failure; if success, then the build id would be useful (if it has been allocated at this stage).