I agree on more outlets. I have mine every 8 feet with 4 recepticals each and sometimes their all in use.
I understand the plumbing decision. If it were me I'd still add the rough ins because it it cheap to do now and preserves options later, if you change your mind.
One thing I considered and was encouraged to do, but didn't and now wish I had done was to put in a floor drain.
The contractor also suggested putting in a floor anchor to use if needed with a come along. I am glad I decided to do that as it has come in handy several times. He buried a 1/4 inch thick, 12 inch long piece of 4 inch on a side U shaped steel and ran some rebar through it. At about the center he predrilled for a 1/2 bolt to plug the hole during the pour. Later the bolt was removed and replaced with a bolt cut for a large standard screw driver that serves as a plug when the anchor isn't needed. It fits flush with the floor. When needed I use a 1/2 eye bolt threaded into the anchor to attach the come along.
