[TeMPOraL]

Thanks!

To be clear, the TBLFM there has a separate purpose. My implementation of [2] generates a table with appropriate shape and data items; TBLFM computes sums and products. This allows for manually modifying the table (e.g. adding a line item, rounding off hours, changing them to include tine you don't track in org mode) and having the sums and products recalculated.

(Also, for anyone scared by that TBLFM line noise, Emacs has a way to edit it in more readable form.)