Although I like the idea, the Guild Treasury Contribution window needs a complete revamp. It's been the same since the beginning (AFAIK, at least from a UI/what you can do with it perspective), but years ago there weren't that many entries on that list (there weren't that many buildings that provided guild goods). Unless you use a 3rd party tool, this window, in a strong and active guild, is pretty much useless.
Some sort of overview would be much better than the detail view we have now. Not saying get rid of it, the option to see the full list should be still available, but in general, a summarized view (by day? by player? by age?) would be so much more useful.