I've never had my change rounded up, and would be very upset it if were. Most of the places we eat out at we frequent often enough that the servers know us; sometimes even knowing what I will choose (I tend to get the same thing time after time; dh is more adventuresome). Years ago we ate out somewhere (I think it was steak?) and the waitress added an exrta digit for a HUGE tip! Her manager caught it and called to ask if we had really intended that large a tip (something like a one hundred dollars plus whatever we had actually tipped); we said absolutely not. She was fired and ever since we have been very specific on filling in the exact tip as well as the total on CC slips.
