I don't find anything wrong with the term "steward". It means "someone who serves and oversees preparations for passengers, generally " (Webster's). That's what all our great cabin stewards did! Besides, their nametags read "Cabin Steward". If it's okay with them, it's okay with me.
On our last cruise our Steward told us the $10.00/day tips were pooled, but anything extra wasn't. I'm sure that's not the same for every line.