Most devices (laptops and phones) calibrate the battery capacity again with every full cycle. And they are made to show the battery as 100 % when it is full, no matter what is the wear level of the battery. On laptops you can typically see the current fully charged capacity and design capacity. And thus see the wear of the battery. Still it is displayed as 100 % when fully charged no matter the wear.

N900 doesn't do it the same way. Yes, it calibrates the capacity every full cycle, but it doesn't use the capacity for calculating the percentage. It is only used in calculating the mAh of the current charge. Eg. on a full charge, you'll get the mAh of fully charged battery based on latest capacity calibration. Then the mAh the device sees you having will be divided by design capacity and you get current charge percentage.

It is a feature and not a bug and there is no way around it whatsoever.

If you have something regarding some people having problem with the new phone battery rarely having figures in the order of 70 % or even lower when fully charged, then that is case for another bug report regarding that problem. It is no use reopening the old bug report for a whole different problem, as the bug report only deals with the specific problem it is about.