Sorry, I mispoke. When using system.tag.read, It respects the decimal but not the comma. Some of my tag data gets saved in a table as a float, and when I pull from that and then convert to string, it will respect the comma. I keep a separate table for things like previous day volumes on gas meters, oil meters, and water meters where I can query those things out without having to deal with Ignitions Tag History. I can also guarantee that if a device doesnt poll after the contract hour, a new value doesnt get put in for the day.
I havent had anyone complain about not having the comma.