Is it wrong for a minor-mode to modify major-mode settings.

[Mohammed Sadik P. K.]

Is it wrong (or against convention) if a minor-mode changes major-mode
configurations:

specifically: I need to have a minor mode run only for c-mode, which
deletes some keywords in c-mode and introduces several new keywords.
Also, this minor mode shall change a few syntax rules. Is it better to
create a derived mode for this?

Please CC me as I'm not on the list.

Thank you.