Ah I see, yes I was assuming data at regular intervals (including some data points with a value of 0) for the interSeriesPadding.
ShinobiCharts, both for iOS and Android, only provides vertical candlestick charts.
The only other thing I can think of is that it may be possible to make use of the advanced tick mark customisation features coming in the upcoming v1.5 release (essentially drawing the tickmarks on the plot area at differing lengths). However, this would be very fiddly and not really an intended use for these customisation options. Furthermore, this would only work on Ice Cream Sandwich and upwards devices as the ticks are drawn underneath the plot area.
We don't currently have any plans to add a feature allowing fixed width bars and columns and it's not something we've had requested before. I will however make a note of this but as I said it's not something we're planning on introducing at present. Sorry I couldn't have been of more help!