I agree completely, especially since there is one unused gesture
right
now. Using the down gesture for expanding collapsed messages would
be
so useful. Whether it expanded all messages in the conversation or
just the
previous collapsed message is a choice I suppose. Personally I would
find the expand all more useful or even expanding more messages the
further the gesture is exaggerated.
Although expand all can sometimes cause mayhem and slow down the
reading if you have many collapsed messages, generally most
conversations
contain between like 3 and 5 messages it seems and its functionality
there
would beat out expanding one at a time with each gesture by a long
shot.
And honestly, I find expanding previous messages to be a pretty
common
process and one that is far more time consuming than going to the
previous/next message or back to the inbox.