If i'm having a conversation with someone and it goes on for a while, it can get really annoying to read their reply on the top of the page and then have to scroll all the way down to the bottom to reply.

I realise this is probably not a huge problem and won't be on the top of any to-do list, but was thinking that it would be so much easier if the conversation was done so that the reply box would be at the top of the page. It would make replying to long message conversations that much simpler.

i like the idea

Simple solution for that is to just go to their profile and start a new message. I do it all the time. Not a horrible idea but if it's not implemented than there is a solution.

Or..

press the 'End' key and it takes you to the bottom of the page.