This may have been mentioned a few times in different forums already, but would love something that allows you to choose from all the available hair/beard styles and lengths on the fly. Would be great as part of any of the existing trainers that are already out there. (EDIT: I see this already exists in the Outfit Changer mod. Sadly, it can't be used with jedijosh's trainer at the same time)
Something that allows you to rotate bodyguards/peds anywhere you want (a little like the Object Placement feature in jedijosh's trainer)
The ability to apply anything from the existing list of animations to bodyguards/peds.
The option to have a group of bodyguards follow with a closer formation (ie. they travel closer to the player) I have played around with different formations and they all seem to have everyone walk too far away from the player.