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I use functions in a list column in Rbitcoin pkg which is on CRAN. It works well, not sure if we need to support function column type explicitly. Base c(min,max) returns a list, so better to stay with the list then.
Having that in mind this issue seems to be in fact a FR to not need for [[1L]] to use function, which is duplicate of #582. Re-open if you not agree.
Submitted by: Matt Dowle; Assigned to: Nobody; R-Forge link
e.g.
DT = data.table(ID=1:10,A=rnorm(10),B=rnorm(10),fn=c(min,max))
DT[,fn(A,B),by=ID]
Idea as a result of Damian Betebenner's post to datatable-help on 26 Feb "data.table by versus apply"
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