Possible temporary "fix" for the text message opening in the middle of convo issue!
First, let me apologize if this "solution" has already been discussed. Second, let me apologize if this "solution" doesn't work for you. I kinda stumbled in this but it seems to work every time. When I open the message to be read, I do a quick up down swipe on the track pad and it immediately jumps to the bottom of the message.
Give it a try. Hopefully this will work for others ;-)
Posted from my CrackBerry at wapforums.crackberry.com