If I am working on a new file or freshly open a saved file and want to draw a line, I type “li” in the command line, but it comes up with the “libraries” window. So, for a few operations, I need to type “lin” to envoke the line parameters. Is there any way to supress the libraries from auto-completing? I use line a lot more than libraries. 
You can also create an alias “li” for Line which will force the Line command to run when you type li and Enter no matter what.