Not a perfect solution, but something which might make it a bit quicker (or less mouse clicking) than changing widths / stroke shapes using the line gallery menu etc, might be to create a 'palette' of your lines with different widths, and stroke shapes you will use and put them to one side of your drawing. In the page options menu you have the option to 'give new objects most recent attributes', so set that to on; if you haven't already.

Then when you draw a new line you can use keyboard shortcuts to change the lines you are drawing to one of your 'palette' line styles by selecting the desired 'palette' line then hit ctrl+c to copy it and then ctrl+shift+a to paste attributes. The next line you draw will be the new width/stroke shape and so on. So that's one mouse click to select your 'palette' line and two shortcuts which can be done pretty quickly, one after the other, if you keep ctrl depressed. Depending on whether you have just a smallish number of line styles, this may be a bit easier to do.

This works better if you are using the freehand tool to draw lines rather than the shape editor tool as you can select lines with the former more easily (ie just a left click). To directly select a line using the shape editor tool you need to right click on the line (if your right mouse button is set to pop-up menu that is), this brings up the shape editor tool pop-up menu which you need to hit enter key or click again to remove. Or alternatively right click on line with the shape editor tool with dash key (-), num pad minus or enter key depressed beforehand; which should remove the pop-up menu automatically as soon as you right click on the line.

Regards

Su