easy or not, isn't the question WHAT to code?
For me this raises further questions. Should the layer name and the column name (which are somehow similar/related) be part of a deck or rather a composition? I could imagine that depending on the situation both makes sense.
Right now layer names are per composition, are they? as well as transition types, opacity and volume, bypass, etc.
I personally would like to have a per deck option. So column and layer names change, predefined transitions change and also bypass and opacity are linked to the deck.
Overall custom names for columns makes totally sense to me. +1
(especially if it's so easy to implement)