We'd love to do an iPad optimized version of Nitrox Tools, but as you guessed it is a relatively low priority given the demand. That is not to say we will not do an iPad optimized version, we just need to find the time/resources to do a good job of it. Ultimately, any iPad optimized version of Nitrox Tools would try to take advantage of the additional screen size to have a more appropriate user interface for the iPad.
As I'm sure you know, the current version will install on iPad and will run in "iPhone compatibility" mode. I find that it works quite well if you choose the "2x" option so that it fills the whole screen. Hopefully that will work for you until we can get a more iPad centric design in place.