Yes, if you use the reverse_chain.omac (file://rose.bmc.uu.se/pub/gerard/omac/reverse_chain.omac) macro. This reverts the chain direction in (a part of) your molecule; use this when you've traced (a part of) your structure in the wrong direction; afterwards, restore the loop connections and use lego_auto_mc, lego_auto_sc and lego_side_ch to get all other coordinates.