Ok, here are some first thoughts from playing around with it:
First thing I noticed is how difficult it is to read the black text on the red bars, and to some extent the brown ones as well.
I still think it would be a good idea to give the user the option of full controll via strftime. I can imagine there could be bars where you would prefer to always have the time left in say days instead of the smart setting. Would also make it easier to "localize" the bars for people outside US/GB.
Perhaps an option to add a little spacing between the bars?
Is there an option somewhere to have it not always on top when windowed?
Would be nice if the right-click menu of the individual bars would let you open the properties for that bar.
The textual progress appears to only work for the modern visual theme.
The smooth visual theme has the "update glow" effect on it every time the bar is updated, which is slightly annoying.
I am guessing the visual themes are a new addition, since the colors are wrong as well.
It might be an idea to truncate percentages instead of rounding to avoid having bars show at 100% before the entire time has elapsed.
Some events are "full day", I am a little confused about what I should set the time at. Like my birthday, should is tart at 00:00:00 and end at 23:59:59 the same day next year?
Maybe the option to create bars that just count an amount of time with the ability to start/stop/reset? .. I am thinking along the lines of a "Take a 5 min break" bar that you could reset and start whenever you needed a break.
It's quite fun to play around with, good idea