Illustrator :: Set Grayscale As Default For TIF Export?

99.5% of the work I do for my employer is grayscale and I'd love to set grayscale as the default setting for export of .tif files from Illustrator, rather than cmyk which we very rarely use. Is there any way of doing this? My co-artists and I generate dozens and dozens of tifs every day, and this would not only be a time-saver but would prevent the occasional cmyk tif from sneaking through (they don't work in the system we use and always must be sent back - wasting more time).