Exactly, it is already boring going afk for extended periods of time. Adding more time to that just kills one part of the game to make another more fun.
I agree we need more diversity in PvP, but not sure locking core speeds will really do much. It will really only affect ships that run away.
Most ships I fight want to fight, so we are normally below 10,000kmph until one starts to flee the fight. Maybe pirating haulers is different as most the fight is chasing the hauler at top speeds.
Haulers are always dead regardless unless the PvP pilot makes some huge mistake, a 2-3g Hauler isn't getting away from a 15-19g PvP ship.