During Script-FU script development I frequently analyse the output of my
scripts that appears in the error console. For very long output I often select
everything in the error console and paste into an external editor.

Selecting hundreds of lines using the mouse is tedious. It would be helpful if
an option existed that allows to just select everything in the console. Of
course I could also use the "save-as" option of the console to directly save the
output but selecting files to save to also becomes tedious with time.

The error console already has a menu accessible via right mouse-button clicks; I
suggest to add a select-all entry to that menu.