The lone pull, Well if they are roamers and not statics this is easily doen beacause the leader always runs back to pull spot while his follower walks...using this knowledge on can easily make seperation between roamer leader and follower(kwwp in mind leaders will always need to be pulled last because followers always walk toward the leader).
Statics, Well sergius has the idea somewhat right , the trick here is to try and get one caught on a wall or on the other mob or even using line of sight.(yes Line of sight can do amazing things for a puller)
However this takes several attempts and will work but can be slow.
Its funny because there has been times where i would get one mob to camp me for like 5-10 secs then start to walk back and i would think"OMG SOE fixed it

" only to have the next few pulls like this take 5-10 goes.

It can be done though.Just keep working at it and eventually ya will find a few tricks that work more often then not.
On a side note....
A 2nd monk for everyguild imo find another and beg,cry,kick,scream untill they(your guild) grabs them..your guild raiding life will be so much smoother and fun
