So since I've seen some stupid choices being made in writing recently, I'll say: No, you guys won't have control of permanent lore choices like deaths or story shifting stuff since I recently realized that's the WORST thing to do in writing and now that's my first pet peeve, like- just choose it by yourself or with your friends/team, otherwise it'll ruin a lot of things in your story (like potencial cool arcs and amazing ideas now unable to happen forever) and will just create more fights and dumb drama between your fans.
Good thing is that you guys won't get the burden or fight over lore choices that you guys took control of! bad thing is that you guys won't have control of deaths and choices in my fics unless it DOESN'T affect the story, don't worry though, you guys won't blame yourselves or others that way, only fictional characters are allowed to do that. :)