Unfortunately I record the replays on their automatic cycle (when they change to the next replay automatically). Having to load up 30 replays and record them one at a time is a big hassle. If I opt particles, I opt everyones, and speaking from someone who has flames I don't what them opted out.
You could deactivate your flames on event days if you really want to avoid it. I would however opt them if you won a "best save" position. Other than that I can't do any more as it takes me up to 2 or more hours to get the saveable videos made already.