Apologies for my ignorance, I'm just on a hosted system and don't have the programming smarts to answer this myself.
How tinkerable is the Profile?
-can I re-label fields?
-can I provide hints for fields?
-can I add/delete fields?
-is anyone else doing this and how are they dealing with interoperability issues?
Keywords: ELGG interoperability, interoperability, Your Profile

Comments
All of these things are straight forward if you have access to the actual files. This will change in future releases and we will make it easy for an admin person to set site conditions.
At the moment as we are hosting your pilot I would be willing to make these changes for you if you want?
Cheers.