Hi !
It would be nice to increase your script editor. Just have a better undo or be able to save our script in a file and reload it would be a great plus value. It is too easy to lose our script when we are working from a window to another.
Why dont you use an IDE to create your own scripts and then you can just use them
Here is one you can use to create a groovy project.
https://www.jetbrains.com/idea/
Here is how you can create custom scripts for soap ui
https://www.soapui.org/scripting---properties/scripting-and-the-script-library.html
This will take care of lots of grief you are having.
of course you can raise a feature request
https://support.smartbear.com/
But in the meantime you do the above mentioned steps as a work around
