Thank you for the quick answer. Strangely enough, the recipes work as intended. So the snowy Angmar bricks from your first example use up only one brick and one snowball, but according to the code, they should use four.
Or do I misunderstand something? Or do recipes in general only use one item per input slot and do not care for the numbers at all?
I have posted this on the bug report forum here.
And, btw., where did you get the lotr-mod-code? Does Mevans give some people access to it? Or do you disassemble it from the files?