(First time poster, pls be kind)
Haven't we all experienced that wonderful moment where someone in a party dc's, or leaves and has to be removed? Then we have the trouble of waiting for a replacement.
I know so many times we've all asked friends and fc members to queue in progress to help us out and usually it works in about 2/3rds of cases I think, but those other times when it doesn't are really annoying because, as the joiner, you now have to do the entire run again with some random people whilst your friend still waits, or you quit out putting more people in the same situation.
Why not just implement a "Join party" button on the r-click menu in the fc member list, or linkshells or friends list, whatever. That way it makes it faster to get in and help them out.