During a long conversation, this is what I tend to do now.

Bring up text window.

Click inside chat window.

This then shows hildon keyboard.

Resize window to full screen.

After so many texts, what this does is show like the last two messages at the very top of the screen so you don't have to keep messing around with the scroll bar.

If you could reproduce this effect automatically for those who don't have a hardware keyboard, that would be awesome!