Put the following in your ~/.config/mc/menu to map g and G to git-annex-get and git-annex-drop in the famous mc file manager:

+ ! t t
g git annex get
  git annex get %f

+ t t
g git annex get
  git annex get %u

+ ! t t
G git annex drop
  git annex drop %f

+ t t
G git annex drop
  git annex drop %u