Can we possibly get a back button or a way out of the scan feature for those of us with fat fingers that press it on accident... Theres currently no way out of the option unless you "scan" something....
How is the scan really supposed to work anyway? It tends to cone up with the Wrong card when I do it!
Cancel is coming, it's in the BETA.
General scanning help: http://imtgapp.com/iMtG/Support/Entries/2011/8/4_Mastering_the_Scanner.html