I admit this is sort of "ghetto," but it worked for my needs.
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AutoItSetOption("WinTitleMatchMode",2)
WinWaitActive("Crystal Reports")
$count = 1
Do
send("{APPSKEY}")
sleep(1000)
Send("E")
sleep(1000)
Send("!p")
sleep(1000)
Send("{ENTER}")
sleep(1000)
Send("{DOWN}")
sleep(1000)
$count = $count + 1
Until $count > 200 ;;; fill in the number of RTs you need to edit.
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So I basically run this script and then switch over to my already open Crystal Reports app by clicking on the first RT that I want to edit. The script automatically performs a "right-click," selects Edit, selects "On change of group" under the Reset section, sends an Enter command, and then moves down to the next RT where it performs the same steps again...until it reaches the end of the counter.
I'm sure there's a better way to do it, but having never used AutoIT before, I found this to be the quickest way for me.