Either replace Conquest marks with another system (Hours seems a good substitute) or allow players raising hostility to earn Conquest marks if it results in a successful port battle
Make mods that increase speed reduce mast HP and/or mast thickness
Do not allow players to enter PVP missions (This is to stop noobs being ganked whilst doing PVE) but increase the distance the missions spawn from the port in relation to the rank of the mission. Higher the rank, the further the mission. This allows people to be attacked in the open world whilst in transit and fills the sea with potential targets
Increase the invisibility timer after battle to 60 seconds