Hi fellow Orgers, I started using column view recently, and I would greatly appreciate it if I could add a column with "cumulative sum". In a less-than ideal world it would be the sum of all the values of some property until the current row. In an ideal world, it could only count values of some property A for rows in which property B is set to certain value. I looked at the docstring of `org-columns-summary-types', and it is obviously impossible to do it with it (the `summarize' function always gets all the values and doesn't get the row number on anything like it). How difficult would it be to extend it? (A cursory look at `org-colview.el' suggests that there are quite a few layers of abstraction, so it doesn't look like a 10-minute hack...) TIA, -- Marcin Borkowski http://mbork.pl