I don't 
glad it was useful for you though.
dd1 is hooked, as have put all manner of family photos on, and she is spelling out the names...
it is so very nearly perfect, but blends would really be the icing on the cake, wouldn't they?
ooooh - just had a thought (dd1 currently playing with ipad, so can't check myself) - in the customisation bit, can you add in extra letters? so could add some in there, maybe? not sure how that would work out with the spelling bit, but might be able to work through that?
so you could add 'ch' in, but not sure how, when you make up a flashcard, you get it using 'ch' rather than 'c' 'h' etc.
will have a play later and see what I come up with.
Steven suggested writing to the developers (this was regarding another app, with some tweaking needed - the iwrite one, as school would rather that used phonics instead of letter names), so might be worth a mass email campaign 
the app is marvellous otherwise, isn't it? not come across one so easily customisable before now - was very excited!
the only other solution I have come up with is to turn the letter sounds off, and only have the reward phrases etc - would that work for your ds?