Whilst garage is down for maintenance and I can't upload the latest version.
I tried to re-arrange a little, and force the buttons into hildonButton-finger style.
I also set a background colour to the cells in the treeview.
I'm not sure it's much better, but opinions are welcome.
http://twitpic.com/t33mz

I have started to look at custom cell renderers as an option to actually make it look nicer. but the learning curve is pretty steep.