Fair trade?

Pundits are busy discussing what Clinton could get from Obama in trade for bowing out.  Many people suggest that he could/should give her the VP slot (he shouldn't and won't).  Here's something else I've seen suggested a couple places:

One of the most inviting is the near certainty that the Obama campaign would agree to pay back the $11.4 million she has loaned her own bid, along with an estimated $10 million to $15 million in unpaid campaign expenses. (Thomas Edsall at HuffPo.)

Is there precedence for this? I can't imagine his supporters would want him to do this.

[Update:  And would it be legal?]