Unless someone has written a plugin the answer is no
The reason I think doubles are left out of AppGameKit has allot to do with the way mobiles work
and floats are allot quicker to process. If someone wrote a plugin you would have to use
all of the mathematics functions with it IE add subtract etc to make use of the doubles.
With some clever math trickery it should also be possible to do this I think with strings
if you only want to do math calculations, there are several math functions on the forum
so perhaps do a search and see what you can find
Good luck
fubar
