I'd like to enable rebase.abbreviateCommands.  I added the lines below to my git  file (~/.gitconfig), saved, opened a new terminal, cd to a git repo, then attempted a git rebase -i HEAD~, and I still "pick" instead of "p".  I confirmed git is using this file by removing configurations and observing changes, and by running git config -l.
[rebase]
        abbreviateCommands = true
Doc: https://git-scm.com/docs/git-config (search for abbreviateCommands)
 
     
    