git log: Add a switch to limit the number of displayed lines from the commit messages

Dear git folks,

there are people out there disliking elaborate commit messages, as going over `git log` is tedious as you have to scroll a lot. As I do not like the suggestion to make commit messages shorter by omitting certain details, a way to limit the number displayed lines of the commit messages would be nice to have.

The switch `--format=oneline` exists already. Unfortunately a lot of commits do not have a informative enough summary, so the first lines of the commit message are still needed/desired to understand the commit more.

Could a switch be added, like `--commit-message-lines` (sorry for not coming up with something better) to limit the number of displayed lines? That would be great!

For older git versions, do you know of editor/pager options to achieve this?

Thanks,

Paul