Yes it is possible to do many things, but remember, due to server lag offsets, it will occasionally turn off for a certain amount of time. Everyone, depending on their world has a lucky number. For example, if I click the prayer button 1 time per 150 milliseconds, the prayer doesn't remain on long enough for the game to register a reduction in points. I found this like 1-2 years ago, it's useful, but like I said, be careful with high risk situations. Chinning may be too risky as the prayer can shut off at any time if the lag offsets your clicking.
I shat when I read the post above me...anybody who has watched your .gif file above, will know EXACTLY how it's done ^