I’ve definitely started renders only to hit myself on the head and have to redo. As of latest beta they introduced a preset pulldown but these seem canned presets for FCP so far, and I didn’t see a button to save your own into there.
Now, you could use Batch Requests I think for this, sort of. If you make a batch request for a session, and then click on it later, its settings will be loaded into Render Properties. You can click, then render as normal.