Native word

No, it would not be natural. Presumably you mean, ‘Please put just a little sugar in my coffee.’
When sugar was in cubes rather than in paper packets, "Just one lump of sugar, please."

Thank you

AnonymousIs 'moderate' a native choice to talk about quantity?

No. I would say Not too much sugar, please. (It would be obvious from the situation that I was talking about coffee.)

CJ

CalifJimIt would be obvious from the situation that I was talking about coffee.

Can you think of a situation where someone else puts the sugar in your coffee? Even in a hospital, the sugar (assuming it isn’t banned by the doctor) is separate. The situation I contemplated was that this was an order being placed of a butler, but even there he would likely serv

wilpeterCan you think of a situation where someone else puts the sugar in your coffee?

Yes. I have friends that visit me from time to time and if I make coffee for them I ask "How much sugar? One teaspoon or two? Or do you want to do your own?" If they let me do it, I add the sugar for them and serve them their coffee. It's all very informal.

CJ

Duh! What was I thinking?! Sorry. I guess I've lived alone too long.