1) If you need to insert columns in tables remember to add them from right to left only. I had to repopulate an orgmode table after I modified structure by adding a column to the right of already existing columns and this involved file operations outside of orgmode. I might be able to make a bash script to automate insert-right process but will need to study that.
2) Time duration calculates to zero if duration goes past midnight. If some way exists to join a duration value say that goes from 20:15 to midnight and the next one that goes from midnight to 07:30 and come up with 11:15 for a result this would be useful. --
