For the German language, the Duden commission, or whatever these people that tell German speaking people how to write correctly call themselves again, decided in all its infinite wisdom that people should not put euro and cent into the plural form when talking about amounts. Like 112 euro, 12 cent. BUT, if you talk about certain notes and coins, you should form the plural euros and cents. (As in:"I found two euros on the street" e.g. two coins of one euro each.) Striking, eh?
I have found a summary of these issues, but I had not enough patience nor interest to review it all in detail. It appears to be written shortly after 2002, but maybe it helps in this debate.
But using that as an argument for adding "ime(s)" is like saying that "Haben Sie 'nen Fünfer?" should not be used because it could be understood as asking for a €0.05 coin or a €5.00 note. Surprise, people understand it because it is used in a situation that makes the meaning obvious for both "sides".
