SeriesAggreg: allow to define a unique aggregation function for multiple columns

SeriesAggreg is very useful for calculating annual or monthly indicators.

For example, I use it to calculate annual hydrologic indicator on data.frame containing the simulated flow for plenty of gauging stations.

For doing that, I have to write:

SeriesAggreg(dfQ, Format = "%Y", ConvertFun = rep("calcMyIndicator", ncol(dfQ) - 1))

Could we assume that if a unique function is provided by the user for ConvertFun therefore it is implicitly applied for all columns?

This syntax would be largely more convenient:

SeriesAggreg(dfQ, Format = "%Y", ConvertFun = "calcMyIndicator")