lots of topics deal with red duplicates and what to do about them. Every one I read quickly descended into complaints about that specific proposed solution, or Fatshark, or people voicing their point of view, or whatever else there is someone can complain about.
I would like this thread to be about ideas only - expand on ideas of others or give solutions to perceived issues but stay on topic in a constructive way. If you want to rage, point fingers or demean the opinion of someone else, use one of the various topics that already do that. Telling me this topic is superfluous is superfluous itself, obviously I feel its needed.
With that in mind, here are possible ways to use and/or avoid unused red duplicates.
Upgrading a red item rerolls it into another kind of red item
Put a red item into the existing upgrade slot (the one that upgrades rarity). For 100 scrap or so it can be rerolled in another red item equippable by the current character. Every red item in your possession (regardless of character) can be used.
Dismantling red items grants red dust
Red dust can be used to create red items from a template.
Red items are selected from a customized list
If a red item drops, its from a list the player can customize. E.g. the player selects all weapons and deselects trinkets, charms and amulets. Until the list is changed again, each red item dropped will be a weapon.