I got an invaluable tip regarding Inkscape on OS X today.
One of the problems I have always had with Inkscape is the difficulty selecting object hidden behind others. I have solved this by tabbing, or putting objects in different layers.
It turns out there is a much better way. Simply alt-click multiple times in the same place to toggle between all objects covering that pixel.
Now there is only one problem. The alt key has never worked for me in X on my MacBook Pro. But there is the simple fix.
Put the following two lines into ~/.Xmodmap (you probably need to create the file first):
keycode 66 = Meta_L
keycode 69 = Meta_R
As a bonus I can now create clones using the keyboard shortcut. That is also a time saver.
Thank you Richard for making Inkscape even better.