I have seriously considered adding a new rule to the overall allowing people to only partisipate in one thread at a time.
I haven't because it hasn't been a obvious problem, and We wanted to allow people to play freely.
That said I have noticed people jumping ship from threads because they are dedicating their time in other threads after joining several threads, or being distracted and unsure of their position cause they can't remember what their character was doing.
I want every RP member to go to the Rules discussion for the overall RP area and voice their opinion on whether a rule is needed to limit players to one thread.