I found the msgbox very useful in troubleshooting scripts.
For example, when I was trying out the "usbnet" feature from Kobo Launcher it did not work the first time. I added msgbox lines to the script to find out where it was going wrong, for example:
Code:
insmod /drivers/freescale/foo/bar
msgbox "insmod1" "$?"
If the msgbox is replaced by one that does not wait for a tap, it would be more convenient to watch what a script does, without having to click "OK" many times.