When flagging comments I hit the rate limit often enough for it to annoy. Each 'hit' forces a re-open of the dialog, select reason, hit the "Flag Comment" button - somewhat clunky. Instead, could we keep the button greyed out until any pending rate limit period has expired?
To put it another way: only let me flag if I'm allowed to.
Related: Comment vote throttling makes it annoying to clean up obsolete chat