Easiest way to repeat MANY mouse clicks?
I know you already rejected CliClick, but what if the script was provided for you? It’s actually quite simple. In Script Editor enter the following:

tell application "Google Chrome"
    activate
    repeat 500 times
        do shell script "/Users/&lt;you&gt;/Desktop/cliclick c:" &amp; "1694,18"
        delay 1.5
    end repeat
end tell


Replace 1694,18 with the actual coordinates of the button you want to click. Those can be obtained by pressing ⇧ shift ⌘ cmd 4 and hovering your cursor over the button.

Also replace &lt;you&gt; with your account name, and adjust the delay as appropriate, to account for any animation or form postback.

Obviously this is all assuming the click occurs in the same spot each time. Your question doesn’t specify, although I get the sense that that is the case. Otherwise it would be very hard to script as a repeating click.