Before Citadels hit New Eden, the station undock was a significant conflict driver for roaming gangs in 0.0. You could bubble the undock to catch slow-to-warp ratters, or you could simply sit there, disrupting the everyday business of locals - with the advent of Citadels this is now dead.
The Citadel, down to even the smallest moon-mining platform or engineering complex, is an unkillable 300km web, 200km point, and 100km heavy neut - it is simply impossible for any roaming gang to fight within the death-sphere of a Citadel, and this has removed a lot of conflict from the game.
My proposal is simple: A citadel should be unable to use its weapons and ewar unless its repair timer is active (I.E. it is under attack or it has just come out of a reinforcement timer). This would allow citadels to still provide a significant home-field advantage for threats to its existence.