Line numbers in the script editor

I did a quick scan and didn't see this one suggested.

Probably the one most useful improvement I can think of. Should be pretty simple to. When you're working on a long script and you get an error on line 243 after adding a few lines of code it would be great to be able to pinpoint the exact line of code it's complaining about.

As it is I have comment out lines one by one and run the session in between. A read pain if it's a session that takes a while to get to the bit you need to test.