Add a new action - click then hold
I've seen some other suggestions, but triple clicks and quadruple clicks are just too difficult to do consistently. However, click then hold is super easy. I thought about recommending hold then click, hold then hold...basically a morse code system of 2 digits...but I think anything starting with a hold is too difficult for some people. As I'm sure most of us just hold the button until it does something, rather than counting X seconds.