Know there is a difference between raids and events here.
An event is the day or the run so to speak, and raids are linked to a kill or a manually created snapshot.
Every boss registers into a snapshot, so you have the exact picture of who where there at the kill time.
If you don't want that just disable the addon after you have taken one snapshot or untick them when u are about to upload it. But why don't you want every pic?
I use it like that because we sometimes swap out ppl mid raids, so if I didn't upload each snapshot and I had swapped ppl in or out I would have to make the changes manually.
By using the snapshots at each boss I don't have to do that.
It gives u a bit more work yes when there are more bosses, but you also have a higher lvl of security when awarding dkp.
Maybe Im misunderstanding you, if so apologies