reduce directories in sys/modules ?

Is there a way to reduce the number of directories in sys/modules ?

There seems to be one directory per module, even though many of
those are related and the source resides in one place
(e.g. sys/modules/iwifw/ has three children but the source
is in sys/contrib/dev/iwi ; and the same goes for many other
entries e.g.
sys/modules/digi* <-> /sys/dev/digi,
sys/modules/drm	<-> sys/dev/drm
sys/modules/ata

and many more.
Ideas ?

cheers
luigi