Currently all run chunks play at the same time. So 'run somechunk' will create a run of a chunk that begins at the same time as all other run chunks. Your ques

Currently all run chunks play at the same time. So 'run somechunk' will create a run of a chunk that begins at the same time as all other run chunks. Your question does bring up an interesting idea, which would be to have a 'play somechunk' command that is blocking. But that does not exist at the moment