I am demoing PM and still learning, but one thing that keeps throwing me off are the inconsistent keyboard commands in the windows version.
For example
T - toggles the Tag, but not if more than one image is selected
+ - tags images, but not if more than one image is selected
ctrl+ tags multiple selected images, but can't tag a single image
There might be others, but these are the one's I am struggling with tonight.
In other windows programs I use, the same keyboard command is used for both single and multiple objects. If a single object is selected, the command is applied to that single object. If multiple objects are selected, the command affects all of the selected objects.
With PM, I am having to keep track of not only my images, but the number of those images that are selected.... and then try to remember which keyboard command will work in the current situation.
Anyway, my suggestion is for the same command to work on single and multi-selected images, regardless of how many are selected.