i'm playing with hgfs. here are some first observations/thoughts.

for a given repository foo, if the repository mounted on /n/hg, had a
hierarchy like:

 /n/hg
          /ctl
          /versions
          /foo

it would feel more natural if i could do:

% cat /n/hg/versions  # list versions
...
% echo version rev1 > /n/hg/ctl # pull + update -r rev1, etc.
% ls /n/hg/foo
.... # list of rev1 files
% echo version rev2 > /n/hg/ctl
% ls /n/hg/foo
... # list of rev2 files, etc
% ed /n/hg/foo/main.c <<'EOF'
$a
// a useless comment
.
w
q
EOF
% cat <<'EOF' >/n/hg/ctl
tag "rev1beta1"  # tag this version
note "added a silly comment to main.c and tagged this version as beta1" #
commit string?
push  # push the changes upstream, etc.
EOF

etc.

it would be nice to map as many hg/git operations to file operations as
possible. for the rest providing special files (ctl, versions, etc) and
directives don't seem out of place.