Dabbling a little bit with some old templates of mine I found out that
{{#set:
|property1=value1|value2|value3
|property2=value1|value2|value3
...
}}
can be used to store multiple values for one property. Since I did not find any mention of it as I wanted to confirm this, I would like to ask, whether this is a solid feature (and remains so) or is it unwanted and will be removed somewhen?