One command shows how much games left until qi limit.
Another command shows how much time left until qi limit reset.
Could be merged in one command.

There is a page that shows how many games you've played in the day: http://forum.toribash.com/tori_earnings.php

I think the idea is not bad, and it would be even better if the game warns you when it blows the limit.

That page doesn't show the appropriate day of the games played. For example if you played 70 games from 6pm to 12am, after 12AM the next games might count in the next day on the page i.e 30 games.
Then when the qi resets at 6pm, you played 65 games till 12am, your 65 games will be counted in the same day as of 30 games so that's 95 games. And so on.

Towards the OP, this command might be really useful as for some people who want to keep an eye on the qi limit reset. As you're not always sure at what time you played your first game of the day.
This might also not be such a hurdle to implement apparently.