Sorry but as someone who has only played open for the past 4 years, I don't really want to see chat from solo players that are technically ghosts / inanimate objects that there is no way to interact with who are aren't really there. Should be a way to mute them out.
Not to mention it gives solo players the ability to troll open players by going to any system where they know a open play squadron are based then announcing something like "Hi, im in your system killing your faction, what you going to do?" to have the open players waste their time hunting ghosts.