Yes is possible using an Autostart script that allow You to set the continuos shooting simulated Your pushing on the relative buttons, note that only in Autostart this script is easy because only in that case We have fixed starting positions of the various setting and in consequence is easly to determine the various steps of the simulation
To avoid that You lost Your fun I don't send the script that perform Your request but I suggest You to study a little the ubasic
http://chdk.wikia.com/wiki/UBASIC/TutorialScratchpad and in particular the instructions click_"set"; click_"right" and sleep.
Also I reccomended to put before Your statements the attached filter that exit from the script in the case where the continuos shooting is not applicable and in Play mode.
get_prop 50 x
if x=-32768 or x=-32246 or x=2597 or x=2598 or x=2599
exit_alt
end
else
endif
Bye
