I generally do that sort of modification using a text editor! Mainly LDraw Design Pad that has LDraw syntax highlighting, inlining possibilities, etc...
You may also change BFC statement in MLCad (double click on statement line), or use DatHeader. I highly recommend the use of Datheader anyway before submitting to parts tracker, this tool does a lot validity checks on your file.
You may also change BFC statement in MLCad (double click on statement line), or use DatHeader. I highly recommend the use of Datheader anyway before submitting to parts tracker, this tool does a lot validity checks on your file.