It's worth banning ALL players standing in a base from using attack abilities, because it only hinders pvp progress. As an example, Imperial City arena, yellow or blue base, they are near the gate to another zone, and players standing there can harass players who want to move to another zone.

Or, for example, if you're playing solo, you start getting attacked with ranged abilities and you can't get them at the time, but as soon as you suddenly manage to damage a player and damage them correctly, they immediately run away to a hatch in a safe zone, heal up and fire and interfere again from the base.

It's worth deciding, either ban skill use completely and make the safe zone bigger, or force players to get down from there if they start a fight