Luck - the procedure can't be changed, as it's the chip itself that calibrates itself after 15 seconds below threshold.

BTW, I know you pain - sometimes, I discharged my 3Ah cell with >1A current in the N900 (flashlight, video recording, GPS, FM transmitter, 3G with 1KB pings every 2 seconds, etc) for the same purposes, and boy, how many times I forget to tune it down before shutdown...

BTW, just for the record - when discharging battery with artifically high rate (i.e. much quicker, that you would do normally), you're going to get lower max capacity value - because capacity is relative to discharge current (and in our case, even discharge pattern, as we're using variable discharge current along the way). Sometimes it's beneficial, as it gives you safety margin - for when you think you're approaching 6% during normal usage, you have - in fact - few more left. Or a "buffer" for heavy usage. Anyway, I like to have capacity rounded a little down, instead of up, and then being surprised when I need to do some heavy usage late in discharge stage...

/Estel