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The current formula for calculating percentages seems to work based on some times which have to be entered.
My idea is that maybe if estimated time is not entered then it should take the difference of due date - start date (or current date).
Or even divide the version's due date - start date to all the issues, which is also correct.
Even some weights can be added based on priority or status or even both.
If they aren't entered either then get version due date and so on following the project hierarchy.
Sometimes there are features that are hard to be estimated, so i prefer to leave this field blank (maybe others do the same).
Another case can be when due time is not set, which can be calculated based on average spent time per issue multiplied with the number of issues.
There are tons of variants, which can make the calculations more accurate and make the plugin more polished and attractive.
Any opinions are welcome. My problem is that i don't know ruby, either i would made those changes by myself.