I'm interested in adding a system for flashbacks into an intrigue-heavy Dark Ages Vampire game. Gomad gave some fantastic albeit general ideas in: How to make in-game planning more fruitful and fun? and my players have given their consent for an overhaul of our house rules.
These flashbacks would at the very least allow the group to reduce planning time by allowing them to play out heist style scenes as flashbacks, but I'm interested in any successful implementations for use in any edition of Vampire: The Masquerade (they are pretty similar after all) that would reduce planning time and give players more narrative control. Any flashback rules that make use of a Vampire's excessively long lifespan iswould be a huge plus as well.