I would like to center the date and time section but I cant seem to find any settings regarding it.
I suppose there is no option for that in Pro's customized theme. I will notify you if I find something that can help you with that problem
You can't modify the Mac layout. However you can make your own Mac layout with the default layout and for dock you can use plank. Then you have it as you like.
Yeah, if it is real important to you I will go with @storm's Idea