Thanks for the quick reply.

Keyboard shortcut:
I didn't see an option for a slideshow shortcut the first time around, but I now found it listed under "Run". Thanks

Buffering:
I stand corrected. I was testing using a folder of very large 8MP images. But with more typical image sizes Xee keeps up nicely. I suppose I could request a setting to adjust the buffer size, but I suspect the amount of memory required to buffer 8MP images for fast browsing would be excessive.

Image Rotation in Full Screen mode:
For some reason this doesn't work for me. In normal window view, I can use Command-R or my custom Command-Arrow shortcuts to rotate images in both directions. But in full screen mode neither shortcut seems to have any effect. Any suggestions?