Add column to drawing table without expanding repeat region
I have a drawing table which consists of a few repeat regions, each in its own column. I wish to add another column to the drawing table, with its own repeat region. When I add a column to the table, the adjacent column's repeat region is expanded to encompass both its own column and the new one I just added. This is a problem when you're not paying attention because if you subsequently add a repeat region to what you think is an empty column, you instead have overlapping regions, which will likely give odd results (blanked cells, etc).
A workaround is to delete the offending multi-column repeat region, then redefine it, but this could be a pain if a lot of filters are defined for it, etc.
Therefore, I have two questions, either of which might solve my problem:
(1) Is there a way to redefine a repeat region's extent in the table so it can be changed so it only refers to one column?
(2) Is there a technique for adding columns to a table that will avoid this mess altogether?