I was thinking a god way to promote Alliances, Team-Ups, and allow players to generate more ISO (Something nearly everyone on the boards has asked for) they could offered a small ISO reward for loaning characters out to other Alliance members. A bit of a reward for helping out fellow Alliancemates and for loosing the use of that character for a time.
Give a small ammount of ISO for each hour the character is “out of play”, and to cut down on abuse it can be assign specificly to the character that was loaned out.