Currently looking at setting a isVP custom field for our RT users, this
custom field will be used to prepend [VP] to ticket subject onCreate.
We are using RT 4.0.4, currently familiar with getting/setting Ticket
Customfields via Scrip and external Script, but not sure how User custom
fields are handled. Will be running through all users and setting the
customfield as required, also looking to add it as part of User creation.