Hi ProbableTrain,
I totally second the iPad version. I've played around with the tool on my iPad, and I have noticed that you do have to tap the different tools repeatedly to ensure that you toggle between them successfully. I can keep checking out how the features work on iPad as well.
Do you know if the tool would work with an iPad that has a bluetooth mouse connected? A recent-ish iOS update added mouse and trackpad support, though I do not currently have a mouse compatible with my device.