Modernize the MDI. Allow manual ordering of tabs. Put the close x on the tab. Right-click for options like "close all other". etc
Jason Schaeffer commented
Under "modernize the MDI", I'd like to be able to split the viewing area so we can have two groups of tabs and two Access objects visible at the same time. If I had a nickel for every time I've wanted to view the output of two queries at once...
rearranging the tabs by dragging would be nice when I use tabbed view (which most of the time I do not)
Heinz Hoegel commented
...and multiple rows of tabs (if you want to have them).
and a Close AND Save when in design view
Kipp Woodard commented
Pinning, unpinning of properties pane. Dockability of object and properties panes. Basically the same MDI functionality that Visual Studio and SQL Server Management Studio have.