Idea: drag'n'drop merge of gmail conversations

#Gmail allows you to drag and drop the conversations in your inbox (for example, you can drag a conversation to a label, to apply that label to it). It'd be great if you could drop one conversation onto another in order to combine them.

Recently I've been planning a holiday with some friends and this planning, and the associated details, like confirmations of flight bookings, spans several separate email conversations.

If I could put them all together in one place it would make it so much easier to deal with the information. (I've submitted this idea as a feature suggestion to the gmail team).

(for interest's sake, the planning is for a trip to South Australia).