[NTG-context] Extending into the left margin

Hi all. I'm using the nice \bTABLE natural tables commands to set my tables. I'm now running into tables which need a little extra space, and since I have a wide left margin I would like them to extend into it. By default they extend into the right marging, which doesn't have very much space and looks ugly. Because I'm using [split=yes] to enable tables to split over pages, I don't want to just put the whole table in a box and then shift it to the left. I am wondering if I can use a localised setuplayout to change the left margin just for the duration of the table? Or is there another clean way to get specific tables to extend into the left margin? Many thanks. Duncan dh@capdm.com