I've been thinking recently about requesting a system for visiting a clan, in addition to the option of joining it; something similar to the application system, where the current higher-ups in the clan would still need to approve it. Here's the basic idea.
There would be some sort of button or command on the main clan page similar to the application button, only instead reading "request visitation to this clan", or possibly a button only for clan leaders that will let them invite people to visit their clan instead of allowing anyone to apply. Upon accepting this, the person in question would be able to visit the main clan halls, chat and RP with the ones inside without having any actual authority or powers in the clan, or having to make an actual commitment to the clan itself. I believe this would benefit in allowing for much more cross-clan RP potential, as well as helping clans acquire more members by letting people use the visiting system to check things out before they would decide to join. In addition to this, possibly add a time limit of a certain number of days a person can visit the clan at any one time, or limit the number of clans they can visit, so as to prevent clan hoppers from hanging out in every clan out there at once.
There are more details I had in mind, I think, but I can't seem to remember them at the moment. When I do, I'll be certain to edit this post and add them in. For now though, good idea, bad idea?