It is a matter of habit I suppose, I do it in a similar way with keyboard without the mouse.
But changing habits is difficult

In Firefox I assigned the shortcut key to Alt instead of Alt+Shift.
And each field as a letter assigned, so it allows to go directly to a field with Alt+letter.
year = n
make = n
model = d
extra = x
chassis = c
mk = m
class = a
origin = o
madein = b (built in)
madefor = f
episode = e
important = r (role)
timecode = t

save/submit = s (in all the forms)

There are also shortcuts for many admin links