So, I think volunteer for team up is a great feature that makes it a little easier for max leveled players to help lower leveled players complete boss fights/dungeons. However, I think there can be improvements. (these improvements would also just be good for the kiosk in general)
Split the Drains (aside from that level 15 dungeon) and Catacombs into a separate category from Wizard City. I think this would be a good change because the average player who wants to help people beat a three streets boss fight probably isn't looking to fight bosses with 50,000+ health.
Special dungeons should be moved in the the four dungeons on the kiosk. When I say "special dungeons", I'm referring to dungeons like Waterworks or Tower of the Helephant, that are much harder than their surroundings. I think they should be moved into the category "Dungeons", where all of the dungeons in the four dungeons areas are. Like the pervious example, if I want to help people out in Wizard City, I'm probably not looking to help people with harder/longer dungeons like Waterworks or Briskbreeze Tower.
Include a special category for non-members. If I'm no longer a member but still want to help weaker players out, I want to be able to volunteer for team ups, but only for free-to-play areas.
If you have additional ideas for the improvement of this feature or think that my ideas could be improved upon, I'd love to know.