I actually LIKE the mentoring idea, with some caveatts. Mentoring should be an extension of RFAF

1.) The new guy (FNG) starts at level 1, just like we did.
2.) Experience gains are still increased (as per today).
3.) A new tier of BIND TO ACCOUNT craftable 'Heirlooms' that are only tradeable to a RFAF related accounts.
4.) Rewards for the Referring (as opposed to just the FNG) as the FNG gains levels. Maybe rep towards a 'developmental' sub faction (Exploreres Guild rep for Alliance, Warchiefs Own rep for Horde side).

I don't like the idea of a FNG jumping right into end-game. It is not 'fair' to the FNG because they don't know their class or any of the back story. It is not 'fair' to other raiders who have to depend on the FNG for thier success in the raid.

But by tying rewards to the development of the New Guy, you would encourage better behavior toward new people by 'established' people. And while the current craftables are... adequate, a new class of craftables tailored toward speeding/easing the leveling experience for new people would make crafting... worthwhile again. [current end-game crafting is fail. By the time you have enough rep for a pattern, you have a drop which is better for that slot, I mean, whats the point? And the materials cost is so high, that no one makes them to sell]