This behavior is by design. Users complained that they did not need to specify the name, layer etc while creating a series of lines. So we changed it to keep the initial info the same and allow the user to start a new line on the same dialog.
If you exit the command and start it again you go back to the first dialog. If you first start the command pane (F12), then run the command, you can close the command and then press the space bar to start the command again. This allows you to change the info for the next line.
You can also run the Quick line command from the macro tab. This command allows you to change the name and stay in the command pane.
tim