Humm, I dunno, but we are developing a nation of "mad-clickers", I bet it would sure help the computer addicts, allowing them to click on something other than their mouse.
But, I guess it could lead to Repetitive Stress Injury of the thumb, so, maybe bad idea.
Personally, I find a single flashlight with a variable beam, spot to wide flood, to be the most important feature in a flashlight for me. There is nothing like a pencil beam when you need to throw distance, and then a nice even full flood (without a hotspot) for walking trails at night.