Full disclosure: I am miserably horrible at lockdown, and I am therefore putting this suggestion out there for those who actually enjoy/are good at lockdown to comment and provide their insights. Also, apologies if this has already been suggested, but a search didn't yield a previous thread on the topic.
All that having been said, the recent PvP bugs got me thinking about the relative levels of customization available to players in PvE vs. PvP. The sword/gun/bomb attack bonuses (dmg/ASI/CTR) knights receive from their gear apply equally to PvE and PvP, but there has never been a situation prior to the introduction of lockdown (I know there was PvP in beta, but I'm talking about since open release) that has potentially necessitated defense bonuses parallel to the regular attack bonuses we all know and love.
Specifically, I'm thinking of either gear or trinkets with something along the lines of stackable sword/gun/bomb defense bonuses. Similarly, gear or trinkets that could extend the effectiveness/duration of each classes' special ability. I know people will likely howl at the prospect of an über-striker with extra dash and sword dmg resistance, but my thought is that having gear/trinkets with these sorts of defensive bonuses could help address some of the balance issues that seem to constantly plague lockdown--not so easy, for example, to one-shot a guardian with additional defense against sword dmg and a bonus to the guardian's shield. Also, this would lend an additional level of customization to loadouts that could better address the specifics of the players you are facing in a match.
Anyway, that's enough from me--thoughts?