Every crew on the statistics receives visitors at some time or another. Some even have medals or badges for visitors to put on their profile to show that they are not a full member of the crew. I have even seen players collect badges to show that they have visited several crews and are a popular player. However I believe that the game should have a specific feature to accept a new member to your crew specificity as a visitor.
If such a feature were coded the crew could have several protected threads on their forum. It could be that only full members can see anything, and possibly only threads which council members could see. A ranking system within the crew could be very useful for crew security. It may even limit what threads could be created or if they are allowed to take part in crew games. However this feature has potential for a lot more than just defense of information.
When a visitor joins a crew there is always a risk of the crew being insided. Imagine if you had the option to set next to a crew member that if the crew is shot than this specific person will be kicked out of the crew. Suddenly anyone who you don't trust one hundred percent can no longer stab your crew in the back and steal it. This brings a whole new level to the security and defense of the crew.
One major element to this has to be limitations. It shouldn't be possible for a crew Boss to set all of their crew members as a visitor for example. An idea that was suggested would be that each size rank of the crew unlocks more visitor slots. A small crew, only fifteen members, wouldn't need more than one visitor space. A medium sized crew, up to fifty members, should have five visitor slots. A large sized crew, up to one hundred members, may have up to fifteen visitor slots. As an example. These numbers can be played with in order to find the correct balance.
A final thought on this idea is that new members to your crew could be given a trial period as a visitor. If they prove themselves loyal and a useful member than they could be promoted to member and given full access to the forums and the ability to hold the crew, if they are a high enough rank, when the boss/higher ranks are shot and killed. If the idea of a full ranking system was implemented than a full hierarchy as to who receives the crew could be set up by the crew boss and another level of safety brought into the crew structure, making it almost impossible for that crew to be insided.
The game, however, still needs other more important updates. This isn't something we are likely to see anytime soon. It is just an idea that would help out crew bosses and protect the member of the crews a little bit better. If you have any thoughts on this matter, please comment below. As always, good luck and happy ranking!