On stuff that wants to see a 600 ohm load at it's output... yeah, it's probably a good idea to add the load... but where to add it? I rarely use inserts, more often than not I will put outboard gear before the input to the channel, which generally means a balanced input to the desk, and depending on the desk, it's usually set up for a proper load. Very little equipment in current manufacture requires a 600 ohm load, so it has become less and less of an issue.
As far as wiring goes, that will depend more on the ground scheme you have chosen for your studio than anything else. The one thing you definitely want to make sure happens is that you have both the hot and the neutral connected when coming to and from a balanced unit... as far as what happens with Pin 1, that will be defined by the grounding scheme of the facility.
I hope this is of some assistance.
