Line Numbers
Ctrl + N - Line Numbers.

For those who work with scripts or write their own, I am sure you have had occasions when you get the message when viewing, "error in script on such and such line". Trying to count and figure out which line it is referring to can often be frustrating and annoying. The error could be something as simple as a missing closing tag!

With your script loaded in the Editor window of Mokum Mail, you can press CTRL+N on your keyboard (which indicates numbers), and the lines in the Editor will be prefixed with numbers. Now if you know which line number is causing the error, it is easy to scroll to that line in the script to debug the problem.