Change rectange tool default stroke to fill
When you create a new rectangle, it is annoying that it always adds the stroke to it by default, forcing you to resize the rectangle after you have removed the stroke. Resizing is needed after removing stroke, because you first draw the rectangle to its correct size and then when you remove the stroke, it leaves a tiny gap as the stroke was aligned outside the rectangle.
Personally I need stoke rarely, but fill almost every time. I am pretty sure others find stroke to be the not-so-often used one, too.
So, why not change the default stroke to be a default fill instead?
With nothing selected, just set stroke size to 0. Now, if you create a rectangle, no stroke anymore...