I've made a tweak on my machine, which I suggest should be implemented in the main code.
M.draw function, line 1:
Change the message which shows the rate to:
As you can see, all I've done is add "*60" and changed "sec" to "min".
It means that I don't see small numbers like "0.03/sec" anymore.
Right at this moment my mana is "5/31" and regenerating at "0.88/min"
It's more informative this way, I think.