I like the research screen of beta 4, it's much more accessible then older versions.
When moving the tech tree, it does not stop moving when i release the mouse outside of the GalCiv window, it's pretty irritating and makes me wish there where no window at all. Same goes for the main screen (map), if you release the mouse outside of the GalCIv UI, it sticks to the mouse and you have to click again to "release" it.
Also, when I move around the tech tree i wish it could be zoomed in and out like on the main screen, as keeping the overview about what to develop next is almost impossible and confusing ( understand that you included the summary at the top left for that reason, but it's not immediately clear to me why you patch it that way instead of the more logical way of zooming in and out)
cheers
BvG