I tend to do that stuff "Post creation" so the only time I need the dialogue is to do those things. That being said I don't see any reason why those items can't or shouldn't be in the dimensions properties window. Some of them actually are already.
In fact I can't tell you how many times I've actually canceled that window thinking I had to do an equation in the properties window only to have to re-open that dialogue to do an equation.
I suppose if you had configuration differences for everything and alot of equations it might save some time, but a vast majority of what I do are just dimensions and the time I waste with the extra click is way more than I save from having those items on the screen.